Abstract

Two different spectroscopy light sources are used to observe the spectrum of six-times-ionized argon, Ar vii, in the vacuum ultraviolet range, 300–1100 Å. Fifty-eight transitions are identified as combinations between levels of the 2p6 (3s2+3p2+3s3d) and 2p6(3s3p+3p3d+3s4p) configurations. For 44 of these transitions the classification is new. Twenty-nine levels are determined that belong to these configurations, where 14 of these are new. The energy parameters are obtained with Hartree–Fock relativistic calculations. The energy levels of the configurations are interpreted by fitting the theoretical energy expressions to the experimental levels with the least-squares approach. Isoelectronic comparisons along the Mg i sequence are used to support the experimental results.

© 1997 Optical Society of America

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1992 (1)

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

1991 (1)

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

1990 (1)

C. Jupén, B. Denne, and I. Martinson, “Transitions in Al-like, Mg-like and Na-like Kr and Mo, observed inthe JET Tokamak,” Phys. Scr. 41, 669–674 (1990).
[CrossRef]

1989 (7)

V. E. Levashov, “Spectra of n=3–n=3 transitionsin K VIII, Ca IX, and Ti XI magnesium-like ions,” Opt. Spectrosc. 66, 449–451 (1989).

S. S. Churilov, V. E. Levashov, and J. F. Wyart, “Extended analysis of the 3d2–3p3d transitionsin the sequence K VIII–Cu XVIII and isoelectronic trends in Ma-like ions through Kr XXV,” Phys. Scr. 40, 625–633 (1989).
[CrossRef]

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

T. Brage and A. Hibbert, “Plunging configurations and J-dependent lifetimesin Mg-like ions,” J. Phys. B 22, 713–726 (1989).
[CrossRef]

A. G. Trigueiros, M. Machida, C. J. B. Pagan, and J. G. Reyna Almandos, “A spectroscopic study of radiation produced in a theta-pinch,” Nucl. Instr. Methods Phys. Res. A 280, 589–592 (1989).
[CrossRef]

J. Sugar, V. Kaufman, P. Indelicato, and W. L. Rowan, “Analysis of magnesium spectra from Cu XVIIIto Mo XXXI,” J. Opt. Soc. Am. B 6, 1437–1443 (1989).
[CrossRef]

M. Gallardo, F. Bredice, M. Raineri, and J. G. Reyna Almandos, “Light source for obtaining spectra of highly ionized gases,” Appl. Opt. 28, 4513–4515 (1989).
[CrossRef] [PubMed]

1988 (5)

A. Redfors, “The 3d2 configuration in Ca IX–Zn XIX,” Phys. Scr. 38, 702–706 (1988).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

J. Sugar and V. Kaufman, “Additions and revisions to the levels of magnesium-like Cu XVIII and Zn XIX,” J. Opt. Soc. Am. B 4, 2010–2011 (1988).
[CrossRef]

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

1987 (6)

B. C. Fawcett, A. Ridgeley, and G. E. Bromage, “The spectrum Ar IX and extended spectralclassification in Ar V to Ar VIII and Ar X,” Phys. Scr. 18, 315–322 (1987).
[CrossRef]

A. Hibbert and F. P. Keenan, “Oscillator strengths for intercombination and forbidden transitionsamongst the 3s2 and 3s3plevels in Al II,” J. Phys. B 20, 4693–4697 (1987).
[CrossRef]

K. L. Baluja and M. Mohan, “Electron impact excitation of forbidden and allowed transitions inCl VI,” J. Phys. B 20, 831–838 (1987).
[CrossRef]

U. Litzén and A. Redfors, “Revised and extended analysis of transitions and energy levels in the n=3 complex of Mg-like Ca IX–Ge XXI,” Phys. Scr. 36, 895–903 (1987).
[CrossRef]

J. Sugar, V. Kaufman, and W. L. Rowan, “Resonances transitions in the Mg I andAr I isoelectronic sequences from Cu to Mo,” J. Opt. Soc. Am. B 4, 1927–1930 (1987).
[CrossRef]

R. L. Kelly, “Atomic and ionic spectrum lines below 2000 Å: hydrogen troughkrypton, part I (H–Ar),” J. Phys. Chem. Ref. Data Suppl. 1, 401–408 (1987).

1986 (4)

J. Sugar and V. Kaufman, “Copper spectra in a laser-generated plasma: measurements and classificationsof Cu XII to Cu XXI,” J. Opt. Soc. Am. B 3, 704–710 (1986).
[CrossRef]

J. Sugar and V. Kaufman, “Mg-like spectrum of Cu XVIII,” J. Opt. Soc. Am. B 3, 1612–1612 (1986).
[CrossRef]

K. Aashamar, T. M. Luke, and J. D. Talman, “Energy levels in the magnesium sequence, Mg I–Mn XIV, calculated in the multiconfigurationoptimized potential model,” Phys. Scr. 34, 386–393 (1986).
[CrossRef]

B. C. Fawcett, “Calculated oscillator strengths, wavelengths and energy levels forallowed 3–3 and 3–4 transitions for Fe XV with isoelectronic comparisons between Dirac–Fock and Hartree–Fock,” Phys. Scr. 34, 331–336 (1986).
[CrossRef]

1985 (2)

K. L. Baluja and A. Hibbert, “Energies and oscillator strengths for allowed transitions in S V, Cl VI, and Fe XV,” Nucl. Instr. Methods Phys. Res. B 9, 477–486 (1985).
[CrossRef]

S. S. Churilov, E. Y. Kononov, A. H. Ryabtsev, and Y. F. Zayikin, “A detailed analysis of the n=3–n=3 transitions in the Mg-like ions Fe XV, Co XVI, and Ni XVII,” Phys. Scr. 32, 501–503 (1985).
[CrossRef]

1984 (2)

N. J. Peacock, M. F. Stamp, and J. D. Silver, “Highly-ionized atoms in fusion research plasma,” Phys. Scr. T8, 10–20 (1984).
[CrossRef]

N. Reistad, T. Brage, J.-O. Ekberg, and L. Engström, “J-dependent 3s4p 3Pjlifetimes in Mg-like sulfur and chlorine,” Phys. Scr. 30, 249–254 (1984).
[CrossRef]

1983 (3)

1982 (3)

M.-C. Buchet-Poulizac, J. P. Buchet, and P. Ceyzeriat, “Spectroscopie et durees de vie dans Ar VI–VIII,” Nucl. Instr. Methods Phys. Res. 202, 13–18 (1982).
[CrossRef]

C. Froese-Fischer and M. Godefroid, “Lifetime trends for the n=3 singlet states in theMg sequence,” Nucl. Instr. Methods Phys. Res. 202, 307–322 (1982).
[CrossRef]

C. Froese-Fischer and M. Godefroid, “Short-range interactions involving plunging configurations of the n=3 complex in the Mg sequence,” Phys. Scr. 25, 394–400 (1982).
[CrossRef]

1981 (2)

1977 (1)

P.-O. Zetterberg and C.-E. Magnusson, “The spectrum and term system of P IV,” Phys. Scr. 15, 189–201 (1977).
[CrossRef]

1971 (1)

J.-O. Ekberg, “Analyses of the Mg I-like spectra K VIII, Ca IX, Sc X and Ti XI,” Phys. Scr. 4, 101–109 (1971).
[CrossRef]

1969 (1)

1941 (1)

L. W. Philips and W. L. Parker, “Spectra of argon in the extreme ultraviolet,” Phys. Rev. 60, 301–307 (1941).
[CrossRef]

Aashamar, K.

K. Aashamar, T. M. Luke, and J. D. Talman, “Energy levels in the magnesium sequence, Mg I–Mn XIV, calculated in the multiconfigurationoptimized potential model,” Phys. Scr. 34, 386–393 (1986).
[CrossRef]

Baluja, K. L.

K. L. Baluja and M. Mohan, “Electron impact excitation of forbidden and allowed transitions inCl VI,” J. Phys. B 20, 831–838 (1987).
[CrossRef]

K. L. Baluja and A. Hibbert, “Energies and oscillator strengths for allowed transitions in S V, Cl VI, and Fe XV,” Nucl. Instr. Methods Phys. Res. B 9, 477–486 (1985).
[CrossRef]

Ben Sitel, A.

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

Berry, H. G.

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

Bliman, S.

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

Bliman, S. L.

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

Boduch, P.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

Brage, T.

T. Brage and A. Hibbert, “Plunging configurations and J-dependent lifetimesin Mg-like ions,” J. Phys. B 22, 713–726 (1989).
[CrossRef]

N. Reistad, T. Brage, J.-O. Ekberg, and L. Engström, “J-dependent 3s4p 3Pjlifetimes in Mg-like sulfur and chlorine,” Phys. Scr. 30, 249–254 (1984).
[CrossRef]

Bredice, F.

Bromage, G. E.

B. C. Fawcett, A. Ridgeley, and G. E. Bromage, “The spectrum Ar IX and extended spectralclassification in Ar V to Ar VIII and Ar X,” Phys. Scr. 18, 315–322 (1987).
[CrossRef]

Brooks, R. L.

Brown, C. M.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

Buchet, J. P.

M.-C. Buchet-Poulizac, J. P. Buchet, and P. Ceyzeriat, “Spectroscopie et durees de vie dans Ar VI–VIII,” Nucl. Instr. Methods Phys. Res. 202, 13–18 (1982).
[CrossRef]

Buchet-Poulizac, M.-C.

M.-C. Buchet-Poulizac, J. P. Buchet, and P. Ceyzeriat, “Spectroscopie et durees de vie dans Ar VI–VIII,” Nucl. Instr. Methods Phys. Res. 202, 13–18 (1982).
[CrossRef]

Ceyzeriat, P.

M.-C. Buchet-Poulizac, J. P. Buchet, and P. Ceyzeriat, “Spectroscopie et durees de vie dans Ar VI–VIII,” Nucl. Instr. Methods Phys. Res. 202, 13–18 (1982).
[CrossRef]

Chantepie, M.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

Churilov, S. S.

S. S. Churilov, V. E. Levashov, and J. F. Wyart, “Extended analysis of the 3d2–3p3d transitionsin the sequence K VIII–Cu XVIII and isoelectronic trends in Ma-like ions through Kr XXV,” Phys. Scr. 40, 625–633 (1989).
[CrossRef]

S. S. Churilov, E. Y. Kononov, A. H. Ryabtsev, and Y. F. Zayikin, “A detailed analysis of the n=3–n=3 transitions in the Mg-like ions Fe XV, Co XVI, and Ni XVII,” Phys. Scr. 32, 501–503 (1985).
[CrossRef]

Curtis, L.

Denne, B.

C. Jupén, B. Denne, and I. Martinson, “Transitions in Al-like, Mg-like and Na-like Kr and Mo, observed inthe JET Tokamak,” Phys. Scr. 41, 669–674 (1990).
[CrossRef]

Desclaux, J. P.

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

Ekberg, J.-O.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

N. Reistad, T. Brage, J.-O. Ekberg, and L. Engström, “J-dependent 3s4p 3Pjlifetimes in Mg-like sulfur and chlorine,” Phys. Scr. 30, 249–254 (1984).
[CrossRef]

J.-O. Ekberg, “Analyses of the Mg I-like spectra K VIII, Ca IX, Sc X and Ti XI,” Phys. Scr. 4, 101–109 (1971).
[CrossRef]

Engström, L.

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

N. Reistad, T. Brage, J.-O. Ekberg, and L. Engström, “J-dependent 3s4p 3Pjlifetimes in Mg-like sulfur and chlorine,” Phys. Scr. 30, 249–254 (1984).
[CrossRef]

Fawcett, B. C.

B. C. Fawcett, A. Ridgeley, and G. E. Bromage, “The spectrum Ar IX and extended spectralclassification in Ar V to Ar VIII and Ar X,” Phys. Scr. 18, 315–322 (1987).
[CrossRef]

B. C. Fawcett, “Calculated oscillator strengths, wavelengths and energy levels forallowed 3–3 and 3–4 transitions for Fe XV with isoelectronic comparisons between Dirac–Fock and Hartree–Fock,” Phys. Scr. 34, 331–336 (1986).
[CrossRef]

B. C. Fawcett, “Calculated oscillator strengths and wavelengths for allowed transitionswithin the third shell for ions in the Mg-like isoelectronic sequence betweenS V and Ni XVII,” At. Data Nucl. Data Tables 28, 579–596 (1983).
[CrossRef]

Feldman, U.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

Folkmann, F.

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

Froese-Fischer, C.

C. Froese-Fischer and M. Godefroid, “Short-range interactions involving plunging configurations of the n=3 complex in the Mg sequence,” Phys. Scr. 25, 394–400 (1982).
[CrossRef]

C. Froese-Fischer and M. Godefroid, “Lifetime trends for the n=3 singlet states in theMg sequence,” Nucl. Instr. Methods Phys. Res. 202, 307–322 (1982).
[CrossRef]

Gallardo, M.

Godefroid, M.

C. Froese-Fischer and M. Godefroid, “Lifetime trends for the n=3 singlet states in theMg sequence,” Nucl. Instr. Methods Phys. Res. 202, 307–322 (1982).
[CrossRef]

C. Froese-Fischer and M. Godefroid, “Short-range interactions involving plunging configurations of the n=3 complex in the Mg sequence,” Phys. Scr. 25, 394–400 (1982).
[CrossRef]

Hennecart, D.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

Hibbert, A.

T. Brage and A. Hibbert, “Plunging configurations and J-dependent lifetimesin Mg-like ions,” J. Phys. B 22, 713–726 (1989).
[CrossRef]

A. Hibbert and F. P. Keenan, “Oscillator strengths for intercombination and forbidden transitionsamongst the 3s2 and 3s3plevels in Al II,” J. Phys. B 20, 4693–4697 (1987).
[CrossRef]

K. L. Baluja and A. Hibbert, “Energies and oscillator strengths for allowed transitions in S V, Cl VI, and Fe XV,” Nucl. Instr. Methods Phys. Res. B 9, 477–486 (1985).
[CrossRef]

Hitz, D.

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

Husson, X.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

Hutton, R.

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

Indelicato, P.

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

J. Sugar, V. Kaufman, P. Indelicato, and W. L. Rowan, “Analysis of magnesium spectra from Cu XVIIIto Mo XXXI,” J. Opt. Soc. Am. B 6, 1437–1443 (1989).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

Irwin, D. J. G.

Joelsson, I.

I. Joelsson, P.-O. Zetterberg, and C.-E. Magnusson, “The spectrum and term system of S V,” Phys. Scr. 23, 1087–1095 (1981).
[CrossRef]

Jupén, C.

C. Jupén, B. Denne, and I. Martinson, “Transitions in Al-like, Mg-like and Na-like Kr and Mo, observed inthe JET Tokamak,” Phys. Scr. 41, 669–674 (1990).
[CrossRef]

Kania, D. R.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

Kaufman, V.

Keane, C. J.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

Keenan, F. P.

A. Hibbert and F. P. Keenan, “Oscillator strengths for intercombination and forbidden transitionsamongst the 3s2 and 3s3plevels in Al II,” J. Phys. B 20, 4693–4697 (1987).
[CrossRef]

Kelly, R. L.

R. L. Kelly, “Atomic and ionic spectrum lines below 2000 Å: hydrogen troughkrypton, part I (H–Ar),” J. Phys. Chem. Ref. Data Suppl. 1, 401–408 (1987).

Kernahan, J. A.

Kononov, E. Y.

S. S. Churilov, E. Y. Kononov, A. H. Ryabtsev, and Y. F. Zayikin, “A detailed analysis of the n=3–n=3 transitions in the Mg-like ions Fe XV, Co XVI, and Ni XVII,” Phys. Scr. 32, 501–503 (1985).
[CrossRef]

Kucal, H.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

Kurtz, C.

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

Lecler, D.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

Lesteven-Vai ¨sse, I.

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

Levashov, V. E.

V. E. Levashov, “Spectra of n=3–n=3 transitionsin K VIII, Ca IX, and Ti XI magnesium-like ions,” Opt. Spectrosc. 66, 449–451 (1989).

S. S. Churilov, V. E. Levashov, and J. F. Wyart, “Extended analysis of the 3d2–3p3d transitionsin the sequence K VIII–Cu XVIII and isoelectronic trends in Ma-like ions through Kr XXV,” Phys. Scr. 40, 625–633 (1989).
[CrossRef]

Litzén, U.

U. Litzén and A. Redfors, “Revised and extended analysis of transitions and energy levels in the n=3 complex of Mg-like Ca IX–Ge XXI,” Phys. Scr. 36, 895–903 (1987).
[CrossRef]

Livingston, A. E.

Luke, T. M.

K. Aashamar, T. M. Luke, and J. D. Talman, “Energy levels in the magnesium sequence, Mg I–Mn XIV, calculated in the multiconfigurationoptimized potential model,” Phys. Scr. 34, 386–393 (1986).
[CrossRef]

MacGowan, B. J.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

Machida, M.

A. G. Trigueiros, M. Machida, C. J. B. Pagan, and J. G. Reyna Almandos, “A spectroscopic study of radiation produced in a theta-pinch,” Nucl. Instr. Methods Phys. Res. A 280, 589–592 (1989).
[CrossRef]

Magnusson, C.-E.

I. Joelsson, P.-O. Zetterberg, and C.-E. Magnusson, “The spectrum and term system of S V,” Phys. Scr. 23, 1087–1095 (1981).
[CrossRef]

P.-O. Zetterberg and C.-E. Magnusson, “The spectrum and term system of P IV,” Phys. Scr. 15, 189–201 (1977).
[CrossRef]

Marseille, P.

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

Martinson, I.

C. Jupén, B. Denne, and I. Martinson, “Transitions in Al-like, Mg-like and Na-like Kr and Mo, observed inthe JET Tokamak,” Phys. Scr. 41, 669–674 (1990).
[CrossRef]

Mohan, M.

K. L. Baluja and M. Mohan, “Electron impact excitation of forbidden and allowed transitions inCl VI,” J. Phys. B 20, 831–838 (1987).
[CrossRef]

Pagan, C. J. B.

A. G. Trigueiros, M. Machida, C. J. B. Pagan, and J. G. Reyna Almandos, “A spectroscopic study of radiation produced in a theta-pinch,” Nucl. Instr. Methods Phys. Res. A 280, 589–592 (1989).
[CrossRef]

Parker, W. L.

L. W. Philips and W. L. Parker, “Spectra of argon in the extreme ultraviolet,” Phys. Rev. 60, 301–307 (1941).
[CrossRef]

Peacock, N. J.

N. J. Peacock, M. F. Stamp, and J. D. Silver, “Highly-ionized atoms in fusion research plasma,” Phys. Scr. T8, 10–20 (1984).
[CrossRef]

Philips, L. W.

L. W. Philips and W. L. Parker, “Spectra of argon in the extreme ultraviolet,” Phys. Rev. 60, 301–307 (1941).
[CrossRef]

Pinnington, E. H.

Radziemski, L. J.

Raineri, M.

Ramanujam,

Reader, J.

Redfors, A.

A. Redfors, “The 3d2 configuration in Ca IX–Zn XIX,” Phys. Scr. 38, 702–706 (1988).
[CrossRef]

U. Litzén and A. Redfors, “Revised and extended analysis of transitions and energy levels in the n=3 complex of Mg-like Ca IX–Ge XXI,” Phys. Scr. 36, 895–903 (1987).
[CrossRef]

Reistad, N.

N. Reistad, T. Brage, J.-O. Ekberg, and L. Engström, “J-dependent 3s4p 3Pjlifetimes in Mg-like sulfur and chlorine,” Phys. Scr. 30, 249–254 (1984).
[CrossRef]

Reyna Almandos, J. G.

M. Gallardo, F. Bredice, M. Raineri, and J. G. Reyna Almandos, “Light source for obtaining spectra of highly ionized gases,” Appl. Opt. 28, 4513–4515 (1989).
[CrossRef] [PubMed]

A. G. Trigueiros, M. Machida, C. J. B. Pagan, and J. G. Reyna Almandos, “A spectroscopic study of radiation produced in a theta-pinch,” Nucl. Instr. Methods Phys. Res. A 280, 589–592 (1989).
[CrossRef]

Ridgeley, A.

B. C. Fawcett, A. Ridgeley, and G. E. Bromage, “The spectrum Ar IX and extended spectralclassification in Ar V to Ar VIII and Ar X,” Phys. Scr. 18, 315–322 (1987).
[CrossRef]

Rowan, W. L.

Ryabtsev, A. H.

S. S. Churilov, E. Y. Kononov, A. H. Ryabtsev, and Y. F. Zayikin, “A detailed analysis of the n=3–n=3 transitions in the Mg-like ions Fe XV, Co XVI, and Ni XVII,” Phys. Scr. 32, 501–503 (1985).
[CrossRef]

Seely, J. F.

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

Silver, J. D.

N. J. Peacock, M. F. Stamp, and J. D. Silver, “Highly-ionized atoms in fusion research plasma,” Phys. Scr. T8, 10–20 (1984).
[CrossRef]

Stamp, M. F.

N. J. Peacock, M. F. Stamp, and J. D. Silver, “Highly-ionized atoms in fusion research plasma,” Phys. Scr. T8, 10–20 (1984).
[CrossRef]

Stolterfoht, N.

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

Sugar, J.

Talman, J. D.

K. Aashamar, T. M. Luke, and J. D. Talman, “Energy levels in the magnesium sequence, Mg I–Mn XIV, calculated in the multiconfigurationoptimized potential model,” Phys. Scr. 34, 386–393 (1986).
[CrossRef]

Träbert, E.

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

Trigueiros, A. G.

A. G. Trigueiros, M. Machida, C. J. B. Pagan, and J. G. Reyna Almandos, “A spectroscopic study of radiation produced in a theta-pinch,” Nucl. Instr. Methods Phys. Res. A 280, 589–592 (1989).
[CrossRef]

Wyart, J. F.

S. S. Churilov, V. E. Levashov, and J. F. Wyart, “Extended analysis of the 3d2–3p3d transitionsin the sequence K VIII–Cu XVIII and isoelectronic trends in Ma-like ions through Kr XXV,” Phys. Scr. 40, 625–633 (1989).
[CrossRef]

Zayikin, Y. F.

S. S. Churilov, E. Y. Kononov, A. H. Ryabtsev, and Y. F. Zayikin, “A detailed analysis of the n=3–n=3 transitions in the Mg-like ions Fe XV, Co XVI, and Ni XVII,” Phys. Scr. 32, 501–503 (1985).
[CrossRef]

Zetterberg, P.-O.

I. Joelsson, P.-O. Zetterberg, and C.-E. Magnusson, “The spectrum and term system of S V,” Phys. Scr. 23, 1087–1095 (1981).
[CrossRef]

P.-O. Zetterberg and C.-E. Magnusson, “The spectrum and term system of P IV,” Phys. Scr. 15, 189–201 (1977).
[CrossRef]

Appl. Opt. (1)

At. Data Nucl. Data Tables (1)

B. C. Fawcett, “Calculated oscillator strengths and wavelengths for allowed transitionswithin the third shell for ions in the Mg-like isoelectronic sequence betweenS V and Ni XVII,” At. Data Nucl. Data Tables 28, 579–596 (1983).
[CrossRef]

J. Opt. Soc. Am. (4)

J. Opt. Soc. Am. B (5)

J. Phys. B (4)

S. Bliman, P. Indelicato, D. Hitz, P. Marseille, and J. P. Desclaux, “One-electron and two-electron-one photon electric dipole transitionsin the Mg-Like argon spectrum,” J. Phys. B 22, 2741–2749 (1989).
[CrossRef]

T. Brage and A. Hibbert, “Plunging configurations and J-dependent lifetimesin Mg-like ions,” J. Phys. B 22, 713–726 (1989).
[CrossRef]

A. Hibbert and F. P. Keenan, “Oscillator strengths for intercombination and forbidden transitionsamongst the 3s2 and 3s3plevels in Al II,” J. Phys. B 20, 4693–4697 (1987).
[CrossRef]

K. L. Baluja and M. Mohan, “Electron impact excitation of forbidden and allowed transitions inCl VI,” J. Phys. B 20, 831–838 (1987).
[CrossRef]

J. Phys. Chem. Ref. Data Suppl. (1)

R. L. Kelly, “Atomic and ionic spectrum lines below 2000 Å: hydrogen troughkrypton, part I (H–Ar),” J. Phys. Chem. Ref. Data Suppl. 1, 401–408 (1987).

Nucl. Instr. Methods Phys. Res. (2)

M.-C. Buchet-Poulizac, J. P. Buchet, and P. Ceyzeriat, “Spectroscopie et durees de vie dans Ar VI–VIII,” Nucl. Instr. Methods Phys. Res. 202, 13–18 (1982).
[CrossRef]

C. Froese-Fischer and M. Godefroid, “Lifetime trends for the n=3 singlet states in theMg sequence,” Nucl. Instr. Methods Phys. Res. 202, 307–322 (1982).
[CrossRef]

Nucl. Instr. Methods Phys. Res. A (1)

A. G. Trigueiros, M. Machida, C. J. B. Pagan, and J. G. Reyna Almandos, “A spectroscopic study of radiation produced in a theta-pinch,” Nucl. Instr. Methods Phys. Res. A 280, 589–592 (1989).
[CrossRef]

Nucl. Instr. Methods Phys. Res. B (2)

K. L. Baluja and A. Hibbert, “Energies and oscillator strengths for allowed transitions in S V, Cl VI, and Fe XV,” Nucl. Instr. Methods Phys. Res. B 9, 477–486 (1985).
[CrossRef]

S. Bliman, J. P. Desclaux, D. Hitz, P. Indelicato, and P. Marseille, “Collision aspects and spectroscopy of higher states in magnesium-likeargon,” Nucl. Instr. Methods Phys. Res. B 31, 330–335 (1988).
[CrossRef]

Opt. Spectrosc. (1)

V. E. Levashov, “Spectra of n=3–n=3 transitionsin K VIII, Ca IX, and Ti XI magnesium-like ions,” Opt. Spectrosc. 66, 449–451 (1989).

Phys. Lett. A (1)

E. Träbert, R. Hutton, L. Engström, S. L. Bliman, H. G. Berry, and C. Kurtz, “Delayed beam–foil spectra of 3 MeV Ar ions,” Phys. Lett. A 129, 381–385 (1988).
[CrossRef]

Phys. Rev. (1)

L. W. Philips and W. L. Parker, “Spectra of argon in the extreme ultraviolet,” Phys. Rev. 60, 301–307 (1941).
[CrossRef]

Phys. Scr. (17)

P.-O. Zetterberg and C.-E. Magnusson, “The spectrum and term system of P IV,” Phys. Scr. 15, 189–201 (1977).
[CrossRef]

I. Joelsson, P.-O. Zetterberg, and C.-E. Magnusson, “The spectrum and term system of S V,” Phys. Scr. 23, 1087–1095 (1981).
[CrossRef]

J.-O. Ekberg, “Analyses of the Mg I-like spectra K VIII, Ca IX, Sc X and Ti XI,” Phys. Scr. 4, 101–109 (1971).
[CrossRef]

S. S. Churilov, E. Y. Kononov, A. H. Ryabtsev, and Y. F. Zayikin, “A detailed analysis of the n=3–n=3 transitions in the Mg-like ions Fe XV, Co XVI, and Ni XVII,” Phys. Scr. 32, 501–503 (1985).
[CrossRef]

U. Litzén and A. Redfors, “Revised and extended analysis of transitions and energy levels in the n=3 complex of Mg-like Ca IX–Ge XXI,” Phys. Scr. 36, 895–903 (1987).
[CrossRef]

A. Redfors, “The 3d2 configuration in Ca IX–Zn XIX,” Phys. Scr. 38, 702–706 (1988).
[CrossRef]

S. S. Churilov, V. E. Levashov, and J. F. Wyart, “Extended analysis of the 3d2–3p3d transitionsin the sequence K VIII–Cu XVIII and isoelectronic trends in Ma-like ions through Kr XXV,” Phys. Scr. 40, 625–633 (1989).
[CrossRef]

I. Lesteven-Vai ¨sse, F. Folkmann, A. Ben Sitel, M. Chantepie, and D. Lecler, “High resolution V. U. V. spectroscopy of argon recoil ions inducedby an ion beam,” Phys. Scr. 38, 45–54 (1988).
[CrossRef]

C. Froese-Fischer and M. Godefroid, “Short-range interactions involving plunging configurations of the n=3 complex in the Mg sequence,” Phys. Scr. 25, 394–400 (1982).
[CrossRef]

N. Reistad, T. Brage, J.-O. Ekberg, and L. Engström, “J-dependent 3s4p 3Pjlifetimes in Mg-like sulfur and chlorine,” Phys. Scr. 30, 249–254 (1984).
[CrossRef]

B. C. Fawcett, A. Ridgeley, and G. E. Bromage, “The spectrum Ar IX and extended spectralclassification in Ar V to Ar VIII and Ar X,” Phys. Scr. 18, 315–322 (1987).
[CrossRef]

J.-O. Ekberg, U. Feldman, J. F. Seely, C. M. Brown, B. J. MacGowan, D. R. Kania, and C. J. Keane, “Analysis of magnesiumlike spectra from Mo XXXI to Cs XLIV,” Phys. Scr. 43, 19–32 (1991).
[CrossRef]

C. Jupén, B. Denne, and I. Martinson, “Transitions in Al-like, Mg-like and Na-like Kr and Mo, observed inthe JET Tokamak,” Phys. Scr. 41, 669–674 (1990).
[CrossRef]

K. Aashamar, T. M. Luke, and J. D. Talman, “Energy levels in the magnesium sequence, Mg I–Mn XIV, calculated in the multiconfigurationoptimized potential model,” Phys. Scr. 34, 386–393 (1986).
[CrossRef]

B. C. Fawcett, “Calculated oscillator strengths, wavelengths and energy levels forallowed 3–3 and 3–4 transitions for Fe XV with isoelectronic comparisons between Dirac–Fock and Hartree–Fock,” Phys. Scr. 34, 331–336 (1986).
[CrossRef]

N. J. Peacock, M. F. Stamp, and J. D. Silver, “Highly-ionized atoms in fusion research plasma,” Phys. Scr. T8, 10–20 (1984).
[CrossRef]

P. Boduch, M. Chantepie, D. Hennecart, X. Husson, H. Kucal, D. Lecler, and N. Stolterfoht, “Spectroscopic analysis of visible and near UV light emitted by Ar7+ and Ar6+ ions produced in Ar8+–He and Ar8+–H2collisions at 120 keV,” Phys. Scr. 45, 203–211 (1992).
[CrossRef]

Other (9)

R. D. Cowan, The Theory of Atomic Structureand Spectra (University of California, Berkeley, 1981).

B. Edlén, in Encyclopedia of Physics, S. Flügge, ed. (Springer, Berlin, 1964), Vol. 27, p. 80.

Optimization of the energy level values was done with thecomputer program ELCALC, provided by L. J. Radziemski, Jr., Los Alamos NationalLaboratory, Los Alamos, N. M. 87544.

A. G. Trigueiros and A. J. Mania, UNICAMP Rep. Atomic MolecularPhys., “Hartree–Fock and fit energy parameters for the Ar VII spectrum,” 2, 1996 (UNICAMP, São Paulo, Brazil).

R. Hutton, University of Lund, 22362 Lund, Sweden (personalcommunication, 1997).

Ö. Andersson, “A method for atomic spectroscopyof highly charged ions in the Pm isoelectronic sequence,” Master's Thesis(University of Lund, Lund, Sweden, 1995).

G. Lève⁁que, S. Girard, and J. Robin, “Emissionspectrum of highly ionized argon in the 100 to 900 Å range,” J.Phys. 45, 665–670 (1984).

C. E. Moore, “Atomic Energy Levels,” Natl. Bur.Stand., Ref. Data Ser., Circ. No. 467 (U.S. GOP, Washington, D.C., 1971), Vol. I and Vol. II.

K. Rahimullah, P. Tavella, C. Novero, and A. Godone, “Asemi-theoretical calculation of 3s3p fine-structure splittingin Mg I using asymptotic value of quantum defect,”Nuovo Cimento 15, 1113–1121 (1993).

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Figures (1)

Fig. 1
Fig. 1

Observed minus calculated Hartree–Fock wave numbers divided by the net charge of the core plus a constant (1.4) for the transition 3s3d 2D23p3d 2D2.

Tables (4)

Tables Icon

Table 1 Observed Transitions in the Spectrum of Ar vii

Tables Icon

Table 2 Experimental Energy-Level Values of Ar vii

Tables Icon

Table 3 Even-Parity Energy Parametersa

Tables Icon

Table 4 Odd-Parity Energy Parameters

Metrics