Abstract

The sixth spectrum of uranium (U vi) between 80 and 115 nm is studied by observation of transitions following low-energy electron capture by a U6+-ion beam in a H2 gas target. Emission cross sections of several identified transitions are obtained, the energy dependence investigated, and the spectra compared with the predictions of single-configuration Dirac–Fock (SCDF) calculations. Based on tentative identifications, a Rydberg–Ritz parameterization yields a predicted ionization potential only 0.3% above the SCDF result.

© 1992 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]

1991 (1)

C. J. Liu, R. W. Dunford, H. G. Berry, D. A. Church, Phys. Rev. A 43, 572 (1991).
[CrossRef] [PubMed]

1989 (2)

R. Pardo, Nucl. Instrum. Methods B 40/41, 1014 (1989).
[CrossRef]

M. Druetta, T. Bouchama, S. Martin, Nucl. Instrum. Methods B 40/41, 50 (1989).
[CrossRef]

1986 (1)

A. Niehaus, J. Phys. B 19, 2925 (1986).
[CrossRef]

1976 (1)

Berry, H. G.

C. J. Liu, R. W. Dunford, H. G. Berry, D. A. Church, Phys. Rev. A 43, 572 (1991).
[CrossRef] [PubMed]

Bouchama, T.

M. Druetta, T. Bouchama, S. Martin, Nucl. Instrum. Methods B 40/41, 50 (1989).
[CrossRef]

Church, D. A.

C. J. Liu, R. W. Dunford, H. G. Berry, D. A. Church, Phys. Rev. A 43, 572 (1991).
[CrossRef] [PubMed]

Druetta, M.

M. Druetta, T. Bouchama, S. Martin, Nucl. Instrum. Methods B 40/41, 50 (1989).
[CrossRef]

Dunford, R. W.

C. J. Liu, R. W. Dunford, H. G. Berry, D. A. Church, Phys. Rev. A 43, 572 (1991).
[CrossRef] [PubMed]

Kaufman, V.

Liu, C. J.

C. J. Liu, R. W. Dunford, H. G. Berry, D. A. Church, Phys. Rev. A 43, 572 (1991).
[CrossRef] [PubMed]

Martin, S.

M. Druetta, T. Bouchama, S. Martin, Nucl. Instrum. Methods B 40/41, 50 (1989).
[CrossRef]

Niehaus, A.

A. Niehaus, J. Phys. B 19, 2925 (1986).
[CrossRef]

Pardo, R.

R. Pardo, Nucl. Instrum. Methods B 40/41, 1014 (1989).
[CrossRef]

Radziemski, L. J.

J. Opt. Soc. Am. (1)

J. Phys. B (1)

A. Niehaus, J. Phys. B 19, 2925 (1986).
[CrossRef]

Nucl. Instrum. Methods B (2)

R. Pardo, Nucl. Instrum. Methods B 40/41, 1014 (1989).
[CrossRef]

M. Druetta, T. Bouchama, S. Martin, Nucl. Instrum. Methods B 40/41, 50 (1989).
[CrossRef]

Phys. Rev. A (1)

C. J. Liu, R. W. Dunford, H. G. Berry, D. A. Church, Phys. Rev. A 43, 572 (1991).
[CrossRef] [PubMed]

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Figures (1)

Fig. 1
Fig. 1

Top, Spectrum obtained from 85-keV electron capture collisions of U6+ with H2. Previously identified transitions are labeled. Bottom, Least-squares fit to the data.

Tables (4)

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Table 1 Energy Levels of U vi: SCDF Calculations Compared with Measured Values (cm−1)

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Table 2 Observed Transitions Not Previously Identified and Tentative Identificationsa

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Table 3 Net Counts Observed in Some Identified Transitions of U5+ as a Function of Incident Ion Energy in U6+–H2 Collisionsa

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Table 4 Calculated Emission Cross Sections of Identified U vi Transitions Excited by Electron Capture Collisions with H2 at 510 keVa

Equations (2)

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P 2 3 / 2 °
P 2 1 / 2 °

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