Abstract

Improved spectroscopic techniques have yielded high-resolution L-series spectra for Cr. A focused-laser beam was used to generate the plasma source emission. The spectra, collected in two separate spectrograph settings, were identified with the aid of theoretical atomic-structure calculations as 2p–3d transitions in B- and Be-like Cr xx and xxi. Distinct spectral lines were classified by using isoelectronic sequence plots.

© 1984 Optical Society of America

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References

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  1. P. G. Burkhalter, G. Charatis, and P. D. Rockett, "X-ray spectral line coincidences between fluorine K- and transition metal L-series lines," J. Appl. Phys. 54, 6138–6149 (1983).
    [CrossRef]
  2. B. C. Fawcett and R. W. Hayes, "Classification of spectra of K, Ca, Sc, Ti, V and Cr and extrapolation to Fe solar flare lines," Mon. Not. R. Astron. Soc. 170, 185–197 (1975).
  3. V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
    [CrossRef]
  4. G. E. Bromage, R. D. Cowan, B. C. Fawcett, and A. Ridgeley, "Classification of Be i-like iron and vanadium spectra from laser-produced plasmas," J. Opt. Soc. Am. 68, 48–51 (1978).
    [CrossRef]
  5. N. Spector, A. Zigler, H. Zmora, and J. L. Schwob, "Cr, Co, and Ni transitions isoelectronic to the Fe XXIV-Fe XVII lines around 11 Å in laser-produced plasma," J. Opt. Soc. Am. 70, 857–861 (1980).
    [CrossRef]
  6. U. Feldman, G. A. Doschek, R. D. Cowan, and L. Cohen, "Fluorine isoelectronic sequence," J. Opt. Soc. Am. 63, 1445–1453 (1973).
    [CrossRef]
  7. H. Gordon, M. G. Hobby, and N. J. Peacock, "Classification of the x-ray spectra of transitions in the Ne, F and O I isoelectronic sequences of the elements from iron to bromine and in the Na I isoelectronic sequence of gallium to bromine," J. Phys. B 13, 1985–1999 (1980).
    [CrossRef]
  8. V. A. Boiko, A. Ya. Faenov, and S. A. Pikuz, "X-ray spectroscopy of multiply-charged ions from laser plasmas," J. Quant. Spectrosc. Radiat. Transfer 19, 11–50 (1978).
    [CrossRef]
  9. R. L. Kelly and L. J. Palumbo, "Atomic and ionic emission lines below 2000 angstrom," NRL Report 7599, June 1973 (Naval Research Laboratory, Washington, D.C., unpublished).
  10. R. D. Cowan, "Theoretical calculation of atomic spectra using digital computers," J. Opt. Soc. Am. 58, 808–818 (1968); R. D. Cowan and D. C. Griffin, "Approximate relativistic corrections to atomic radial wave functions," J. Opt. Soc. Am. 66, 1010–1014 (1976).
    [CrossRef]
  11. L. N. Koppel, "X-ray calibration of films, SB-5 and RAR 2492 in the 0.18–0.93 keV region," Rep. TR-112-08-12, March 1982 (Advanced Research and Applications Corporation, Sunnyvale, California, unpublished).
  12. R. W. Hayes and B. J. Kent, "The surface preparation of beryl crystals for x-ray spectroscopy," J. Phys. E 14, 688–692 (1981); B. J. Kent, Space and Astrophysics Division, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, England (personal communication).
    [CrossRef]

1983 (1)

P. G. Burkhalter, G. Charatis, and P. D. Rockett, "X-ray spectral line coincidences between fluorine K- and transition metal L-series lines," J. Appl. Phys. 54, 6138–6149 (1983).
[CrossRef]

1981 (1)

R. W. Hayes and B. J. Kent, "The surface preparation of beryl crystals for x-ray spectroscopy," J. Phys. E 14, 688–692 (1981); B. J. Kent, Space and Astrophysics Division, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, England (personal communication).
[CrossRef]

1980 (2)

N. Spector, A. Zigler, H. Zmora, and J. L. Schwob, "Cr, Co, and Ni transitions isoelectronic to the Fe XXIV-Fe XVII lines around 11 Å in laser-produced plasma," J. Opt. Soc. Am. 70, 857–861 (1980).
[CrossRef]

H. Gordon, M. G. Hobby, and N. J. Peacock, "Classification of the x-ray spectra of transitions in the Ne, F and O I isoelectronic sequences of the elements from iron to bromine and in the Na I isoelectronic sequence of gallium to bromine," J. Phys. B 13, 1985–1999 (1980).
[CrossRef]

1978 (2)

V. A. Boiko, A. Ya. Faenov, and S. A. Pikuz, "X-ray spectroscopy of multiply-charged ions from laser plasmas," J. Quant. Spectrosc. Radiat. Transfer 19, 11–50 (1978).
[CrossRef]

G. E. Bromage, R. D. Cowan, B. C. Fawcett, and A. Ridgeley, "Classification of Be i-like iron and vanadium spectra from laser-produced plasmas," J. Opt. Soc. Am. 68, 48–51 (1978).
[CrossRef]

1977 (1)

V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
[CrossRef]

1975 (1)

B. C. Fawcett and R. W. Hayes, "Classification of spectra of K, Ca, Sc, Ti, V and Cr and extrapolation to Fe solar flare lines," Mon. Not. R. Astron. Soc. 170, 185–197 (1975).

1973 (1)

1968 (1)

Boiko, V. A.

V. A. Boiko, A. Ya. Faenov, and S. A. Pikuz, "X-ray spectroscopy of multiply-charged ions from laser plasmas," J. Quant. Spectrosc. Radiat. Transfer 19, 11–50 (1978).
[CrossRef]

V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
[CrossRef]

Bromage, G. E.

Burkhalter, P. G.

P. G. Burkhalter, G. Charatis, and P. D. Rockett, "X-ray spectral line coincidences between fluorine K- and transition metal L-series lines," J. Appl. Phys. 54, 6138–6149 (1983).
[CrossRef]

Charatis, G.

P. G. Burkhalter, G. Charatis, and P. D. Rockett, "X-ray spectral line coincidences between fluorine K- and transition metal L-series lines," J. Appl. Phys. 54, 6138–6149 (1983).
[CrossRef]

Cohen, L.

Cowan, R. D.

Doschek, G. A.

Faenov, A. Ya.

V. A. Boiko, A. Ya. Faenov, and S. A. Pikuz, "X-ray spectroscopy of multiply-charged ions from laser plasmas," J. Quant. Spectrosc. Radiat. Transfer 19, 11–50 (1978).
[CrossRef]

V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
[CrossRef]

Fawcett, B. C.

G. E. Bromage, R. D. Cowan, B. C. Fawcett, and A. Ridgeley, "Classification of Be i-like iron and vanadium spectra from laser-produced plasmas," J. Opt. Soc. Am. 68, 48–51 (1978).
[CrossRef]

B. C. Fawcett and R. W. Hayes, "Classification of spectra of K, Ca, Sc, Ti, V and Cr and extrapolation to Fe solar flare lines," Mon. Not. R. Astron. Soc. 170, 185–197 (1975).

Feldman, U.

Gordon, H.

H. Gordon, M. G. Hobby, and N. J. Peacock, "Classification of the x-ray spectra of transitions in the Ne, F and O I isoelectronic sequences of the elements from iron to bromine and in the Na I isoelectronic sequence of gallium to bromine," J. Phys. B 13, 1985–1999 (1980).
[CrossRef]

Hayes, R. W.

R. W. Hayes and B. J. Kent, "The surface preparation of beryl crystals for x-ray spectroscopy," J. Phys. E 14, 688–692 (1981); B. J. Kent, Space and Astrophysics Division, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, England (personal communication).
[CrossRef]

B. C. Fawcett and R. W. Hayes, "Classification of spectra of K, Ca, Sc, Ti, V and Cr and extrapolation to Fe solar flare lines," Mon. Not. R. Astron. Soc. 170, 185–197 (1975).

Hobby, M. G.

H. Gordon, M. G. Hobby, and N. J. Peacock, "Classification of the x-ray spectra of transitions in the Ne, F and O I isoelectronic sequences of the elements from iron to bromine and in the Na I isoelectronic sequence of gallium to bromine," J. Phys. B 13, 1985–1999 (1980).
[CrossRef]

Kelly, R. L.

R. L. Kelly and L. J. Palumbo, "Atomic and ionic emission lines below 2000 angstrom," NRL Report 7599, June 1973 (Naval Research Laboratory, Washington, D.C., unpublished).

Kent, B. J.

R. W. Hayes and B. J. Kent, "The surface preparation of beryl crystals for x-ray spectroscopy," J. Phys. E 14, 688–692 (1981); B. J. Kent, Space and Astrophysics Division, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, England (personal communication).
[CrossRef]

Koppel, L. N.

L. N. Koppel, "X-ray calibration of films, SB-5 and RAR 2492 in the 0.18–0.93 keV region," Rep. TR-112-08-12, March 1982 (Advanced Research and Applications Corporation, Sunnyvale, California, unpublished).

Palumbo, L. J.

R. L. Kelly and L. J. Palumbo, "Atomic and ionic emission lines below 2000 angstrom," NRL Report 7599, June 1973 (Naval Research Laboratory, Washington, D.C., unpublished).

Peacock, N. J.

H. Gordon, M. G. Hobby, and N. J. Peacock, "Classification of the x-ray spectra of transitions in the Ne, F and O I isoelectronic sequences of the elements from iron to bromine and in the Na I isoelectronic sequence of gallium to bromine," J. Phys. B 13, 1985–1999 (1980).
[CrossRef]

Pikuz, S. A.

V. A. Boiko, A. Ya. Faenov, and S. A. Pikuz, "X-ray spectroscopy of multiply-charged ions from laser plasmas," J. Quant. Spectrosc. Radiat. Transfer 19, 11–50 (1978).
[CrossRef]

V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
[CrossRef]

Ridgeley, A.

Rockett, P. D.

P. G. Burkhalter, G. Charatis, and P. D. Rockett, "X-ray spectral line coincidences between fluorine K- and transition metal L-series lines," J. Appl. Phys. 54, 6138–6149 (1983).
[CrossRef]

Safronova, U. I.

V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
[CrossRef]

Schwob, J. L.

Spector, N.

Zigler, A.

Zmora, H.

J. Appl. Phys. (1)

P. G. Burkhalter, G. Charatis, and P. D. Rockett, "X-ray spectral line coincidences between fluorine K- and transition metal L-series lines," J. Appl. Phys. 54, 6138–6149 (1983).
[CrossRef]

J. Opt. Soc. Am. (4)

J. Phys. B (2)

H. Gordon, M. G. Hobby, and N. J. Peacock, "Classification of the x-ray spectra of transitions in the Ne, F and O I isoelectronic sequences of the elements from iron to bromine and in the Na I isoelectronic sequence of gallium to bromine," J. Phys. B 13, 1985–1999 (1980).
[CrossRef]

V. A. Boiko, S. A. Pikuz, U. I. Safronova, and A. Ya. Faenov, "Spectra of Be-like ions with nuclear change Z = 22,…, 34 from laser-produced plasmas," J. Phys. B 10, 1253–63 (1977).
[CrossRef]

J. Phys. E (1)

R. W. Hayes and B. J. Kent, "The surface preparation of beryl crystals for x-ray spectroscopy," J. Phys. E 14, 688–692 (1981); B. J. Kent, Space and Astrophysics Division, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, England (personal communication).
[CrossRef]

J. Quant. Spectrosc. Radiat. Transfer (1)

V. A. Boiko, A. Ya. Faenov, and S. A. Pikuz, "X-ray spectroscopy of multiply-charged ions from laser plasmas," J. Quant. Spectrosc. Radiat. Transfer 19, 11–50 (1978).
[CrossRef]

Mon. Not. R. Astron. Soc. (1)

B. C. Fawcett and R. W. Hayes, "Classification of spectra of K, Ca, Sc, Ti, V and Cr and extrapolation to Fe solar flare lines," Mon. Not. R. Astron. Soc. 170, 185–197 (1975).

Other (2)

L. N. Koppel, "X-ray calibration of films, SB-5 and RAR 2492 in the 0.18–0.93 keV region," Rep. TR-112-08-12, March 1982 (Advanced Research and Applications Corporation, Sunnyvale, California, unpublished).

R. L. Kelly and L. J. Palumbo, "Atomic and ionic emission lines below 2000 angstrom," NRL Report 7599, June 1973 (Naval Research Laboratory, Washington, D.C., unpublished).

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Figures (5)

Fig. 1
Fig. 1

Cr spectrum in the 14-Å region superimposed upon calculated atomic-structure wavelengths for B-like Cr xx transitions. The height of the computed lines corresponds to the weighted oscillator strengths. The lines are numbered to correlate with classifications in Table 1.

Fig. 2
Fig. 2

B-like isoelectronic sequence. The solid lines are the theoretical wave-number differences for the indicated transitions. The line numbers for the Cr values correlate with lines listed in Table 1.

Fig. 3
Fig. 3

Cr spectrum in the 13-Å region identified with Be-like Cr xxi atomic-structure calculations. The 2p2–2p3d transitions are labeled 1, and the 2s2p–2s3d transitions are labeled 2.

Fig. 4
Fig. 4

Isoelectronic sequence for 2s2p–2s3d transitions in Cr xxi.

Fig. 5
Fig. 5

Isoelectronic sequence for 2p2–2p3d transitions in Cr xxi. The wavelength for the line labeled ➃*was in the 14-Å region.

Tables (5)

Tables Icon

Table 1 B–like Spectra of Cr xx

Tables Icon

Table 2 Relativistic Hartree–Fock Integrals and Least–Squares–Fitted Parameters for the 2s2p2 and 2s2p3d Configurations in Cr xx

Tables Icon

Table 3 Be–like Spectra of Cr xxi

Tables Icon

Table 4 Relativistic Hartree–Fock Integrals and Least–Squares–Fitted Parameters for the 2p2 and 2p3d Configurations in Cr xxi

Tables Icon

Table 5 Relativistic Hartree–Fock Integrals and Least–Squares–Fitted Parameters for the 2s2p and 2s3d Configurations in Cr xxi

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