Abstract

We report the observation of over 100 new high-lying odd levels in atomic uranium between 32600 and 34200 cm<sup>-1</sup> using tunable laser techniques. These augment the 32 odd levels previously determined in this energy regime by conventional atomic spectroscopy. The method used in these studies, multistep photoionization under pulsed dye laser excitation, was also employed to make <i>J</i> assignments, measure radiative lifetimes, and to obtain absorption cross sections of transitions involving these levels.

© 1976 Optical Society of America

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  1. S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).
  2. B. B. Snavely, R. W. Solarz, and S. A. Tuccio, "Separation of Uranium Isotopes by Selective Photoionization," in Laser Spectroscopy, Proceedings of the Second International Conference, Megeve, France, June 23–27, 1975, edited by S. Haroche et al. (Springer-Verlag, Berlin, 1975), p. 268–274.
  3. G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).
  4. L. J. Radziemski, Jr., S. Gerstenkorn, and P. Luc, "Uranium Transitions and Energy Levels Which May be Useful in Atomic-Photoionization Schemes for Separating 238U and 235U," Opt. Commun. 15, 273–276 (1975).
  5. I. Nebenzahl and M. Levin, "Process for Isotope Separation," Patent Disclosure 2312 194, Federal Republic of Germany, 1973 (unpublished).
  6. J. Blaise and L. J. Radziemski, Jr., "Energy levels of neutral atomic uranium, U I," J. Opt. Soc. Am. (to be published).
  7. Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.
  8. L. J. Radziemski, Jr. (private communications, 1974, 1975, 1976).
  9. W. Krupke, (private communication, 1974).
  10. F. Guyon, J. Blaise, and J. F. Wyart, "Etude Parametrique des Configurations Impaires Profondes dans les Spectres de l'Uranium, U II," J. Phys. (Paris) 35, 929–933 (1974).
  11. J. Z. Klose, "Mean life of the 27 877-cmminus;1 level in U I," Phys. Rev. A 11, 1840–1844 (1975).
  12. C. H. Corliss and R. W. Bozman, Experimental Transition Probabilities for Spectral Lines of Seventy Elements, U. S. Natl. Bur. Stds. Monograph No. 53 (U. S. GPO, Washington, D.C., 1962).
  13. S. Tuccio (private communication, 1974).
  14. R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

1975 (3)

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

L. J. Radziemski, Jr., S. Gerstenkorn, and P. Luc, "Uranium Transitions and Energy Levels Which May be Useful in Atomic-Photoionization Schemes for Separating 238U and 235U," Opt. Commun. 15, 273–276 (1975).

J. Z. Klose, "Mean life of the 27 877-cmminus;1 level in U I," Phys. Rev. A 11, 1840–1844 (1975).

1974 (2)

S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).

F. Guyon, J. Blaise, and J. F. Wyart, "Etude Parametrique des Configurations Impaires Profondes dans les Spectres de l'Uranium, U II," J. Phys. (Paris) 35, 929–933 (1974).

Blaise, J.

F. Guyon, J. Blaise, and J. F. Wyart, "Etude Parametrique des Configurations Impaires Profondes dans les Spectres de l'Uranium, U II," J. Phys. (Paris) 35, 929–933 (1974).

J. Blaise and L. J. Radziemski, Jr., "Energy levels of neutral atomic uranium, U I," J. Opt. Soc. Am. (to be published).

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

Bozman, R. W.

C. H. Corliss and R. W. Bozman, Experimental Transition Probabilities for Spectral Lines of Seventy Elements, U. S. Natl. Bur. Stds. Monograph No. 53 (U. S. GPO, Washington, D.C., 1962).

Carlson, L. R.

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

Corliss, C. H.

C. H. Corliss and R. W. Bozman, Experimental Transition Probabilities for Spectral Lines of Seventy Elements, U. S. Natl. Bur. Stds. Monograph No. 53 (U. S. GPO, Washington, D.C., 1962).

Cowan, R. D.

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

Dubrin, J. W.

S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).

Gerstenkorn, S.

L. J. Radziemski, Jr., S. Gerstenkorn, and P. Luc, "Uranium Transitions and Energy Levels Which May be Useful in Atomic-Photoionization Schemes for Separating 238U and 235U," Opt. Commun. 15, 273–276 (1975).

Guelachvili, G.

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

Guyon, F.

F. Guyon, J. Blaise, and J. F. Wyart, "Etude Parametrique des Configurations Impaires Profondes dans les Spectres de l'Uranium, U II," J. Phys. (Paris) 35, 929–933 (1974).

Itzkan, I.

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

Janes, G. S.

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

Johnson, S. A.

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

Klose, J. Z.

J. Z. Klose, "Mean life of the 27 877-cmminus;1 level in U I," Phys. Rev. A 11, 1840–1844 (1975).

Krupke, W.

W. Krupke, (private communication, 1974).

Levin, L.

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

Levin, M.

I. Nebenzahl and M. Levin, "Process for Isotope Separation," Patent Disclosure 2312 194, Federal Republic of Germany, 1973 (unpublished).

Levy, R. H.

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

Luc, P.

L. J. Radziemski, Jr., S. Gerstenkorn, and P. Luc, "Uranium Transitions and Energy Levels Which May be Useful in Atomic-Photoionization Schemes for Separating 238U and 235U," Opt. Commun. 15, 273–276 (1975).

May, C. A.

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

Nebenzahl, I.

I. Nebenzahl and M. Levin, "Process for Isotope Separation," Patent Disclosure 2312 194, Federal Republic of Germany, 1973 (unpublished).

Osman, Z. B.

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

Paisner, J. A.

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

Peterson, O. G.

S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).

Pike, C. T.

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

Radziemski, Jr., L. J.

L. J. Radziemski, Jr., S. Gerstenkorn, and P. Luc, "Uranium Transitions and Energy Levels Which May be Useful in Atomic-Photoionization Schemes for Separating 238U and 235U," Opt. Commun. 15, 273–276 (1975).

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

L. J. Radziemski, Jr. (private communications, 1974, 1975, 1976).

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

J. Blaise and L. J. Radziemski, Jr., "Energy levels of neutral atomic uranium, U I," J. Opt. Soc. Am. (to be published).

Snavely, B. B.

S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).

B. B. Snavely, R. W. Solarz, and S. A. Tuccio, "Separation of Uranium Isotopes by Selective Photoionization," in Laser Spectroscopy, Proceedings of the Second International Conference, Megeve, France, June 23–27, 1975, edited by S. Haroche et al. (Springer-Verlag, Berlin, 1975), p. 268–274.

Solarz, R. W.

B. B. Snavely, R. W. Solarz, and S. A. Tuccio, "Separation of Uranium Isotopes by Selective Photoionization," in Laser Spectroscopy, Proceedings of the Second International Conference, Megeve, France, June 23–27, 1975, edited by S. Haroche et al. (Springer-Verlag, Berlin, 1975), p. 268–274.

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

Steinhaus, D. W.

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

Tuccio, S.

S. Tuccio (private communication, 1974).

Tuccio, S. A.

S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).

B. B. Snavely, R. W. Solarz, and S. A. Tuccio, "Separation of Uranium Isotopes by Selective Photoionization," in Laser Spectroscopy, Proceedings of the Second International Conference, Megeve, France, June 23–27, 1975, edited by S. Haroche et al. (Springer-Verlag, Berlin, 1975), p. 268–274.

Verges, J.

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

Worden, E. F.

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

Wyart, J. F.

F. Guyon, J. Blaise, and J. F. Wyart, "Etude Parametrique des Configurations Impaires Profondes dans les Spectres de l'Uranium, U II," J. Phys. (Paris) 35, 929–933 (1974).

IEEE J. Quant. Electron. (1)

G. S. Janes, I. Itzkan, C. T. Pike, R. H. Levy, and L. Levin, "Two-Photon Laser Isotope Separation of Atomic Uranium-Spectroscopic Studies, Excited State Lifetimes and Photoionization Cross-Sections," IEEE J. Quant. Electron. QE-11, 101D–103D (1975).

IEEE J. Quantum Electron. (1)

S. A. Tuccio, J. W. Dubrin, O. G. Peterson, and B. B. Snavely, "Two-Step, Selective Photoionization of 235U in Uranium Vapor," IEEE J. Quantum Electron. QE-10, 790D (1974). See also, S. A. Tuccio, R. J. Foley, J. W. Dubrin, and O. Krikorian, "Macroscopic Isotope Separation of Uranium by Selective Photoionization," ibid. QE-11, 101D (1975).

J. Phys. (1)

F. Guyon, J. Blaise, and J. F. Wyart, "Etude Parametrique des Configurations Impaires Profondes dans les Spectres de l'Uranium, U II," J. Phys. (Paris) 35, 929–933 (1974).

Opt. Commun. (1)

L. J. Radziemski, Jr., S. Gerstenkorn, and P. Luc, "Uranium Transitions and Energy Levels Which May be Useful in Atomic-Photoionization Schemes for Separating 238U and 235U," Opt. Commun. 15, 273–276 (1975).

Phys. Rev. (1)

J. Z. Klose, "Mean life of the 27 877-cmminus;1 level in U I," Phys. Rev. A 11, 1840–1844 (1975).

Other (9)

C. H. Corliss and R. W. Bozman, Experimental Transition Probabilities for Spectral Lines of Seventy Elements, U. S. Natl. Bur. Stds. Monograph No. 53 (U. S. GPO, Washington, D.C., 1962).

S. Tuccio (private communication, 1974).

R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, and L. J. Radziemski, Jr., "Detection of Rydberg states in atomic uranium using time resolved stepwise laser photoionization," Phys. Rev. A (to be published).

I. Nebenzahl and M. Levin, "Process for Isotope Separation," Patent Disclosure 2312 194, Federal Republic of Germany, 1973 (unpublished).

J. Blaise and L. J. Radziemski, Jr., "Energy levels of neutral atomic uranium, U I," J. Opt. Soc. Am. (to be published).

Much of the information on the U emission spectrum that we used is from D. W. Steinhaus, L. J. Radziemski, Jr., R. D. Cowan, J. Blaise, G. Guelachvili, Z. B. Osman, and J. Verges, "Present Status of the Analysis of the First and Second Spectra of Uranium (U I and U II) as Derived from Measurements of Optical Spectra," Los Alamos Scientific Report LA 4501, 1971 (unpublished); LA 4501 is available from National Technical Information Service, 5285 Port Royal Rd., Springfield, Va. 22151.

L. J. Radziemski, Jr. (private communications, 1974, 1975, 1976).

W. Krupke, (private communication, 1974).

B. B. Snavely, R. W. Solarz, and S. A. Tuccio, "Separation of Uranium Isotopes by Selective Photoionization," in Laser Spectroscopy, Proceedings of the Second International Conference, Megeve, France, June 23–27, 1975, edited by S. Haroche et al. (Springer-Verlag, Berlin, 1975), p. 268–274.

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