A. K. Ray, B. Lal, V. K. Mago, and P. R. K. Rao, "Resonantly enhanced single-color multiphoton ionization of the uranium atom," J. Opt. Soc. Am. B 9, 1979-1987 (1992)
The single-color multiphoton-ionization spectrum of atomic uranium is recorded in the spectral range 615 to 670 nm by using a Nd:YAG-laser-pumped pulsed dye laser. Most of the 176 observed resonances are assigned to resonant-ionization processes involving three photons, but some resonances are suggested to involve four-photon processes. Plausible ionization pathways are suggested for many of the observed resonances, and some new odd levels of uranium are proposed.
Mukesh Lal Shah, Gomati Prasad Gupta, Vas Dev, Bishwaranjan Dikshit, Manmohan Singh Bhatia, and Brij Mohan Suri J. Opt. Soc. Am. B 29(4) 600-606 (2012)
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Difference between the calculated energy level and the known near-resonant level; a plus indicates that the calculated value is greater than the known near-resonant level, and a minus indicates that it is smaller.
Underlined J values are supported by this work.
Odd level proposed in this work.
Resonantly enhanced two-photon transition followed by a third photon ionization in which an intermediate even level, with appropriate J, has a large mismatch. Ref. 10. Ref. 11.
Resonantly enhanced two-photon transition followed by a third photon ionization for which the intermediate level is not, to our knowledge, given in the literature. Ref. 12. Ref. 13. Ref. 9. Ref. 14.
Table 2
Suggested Four-Photon Ionization Pathways for Some Observed Single-Color Resonances in the Atomic-Uranium Spectrum
Difference between the calculated energy level and the known near-resonant level; a plus indicates that the calculated value is greater than the known near-resonant level, and a minus indicates that it is smaller.
Underlined J values are supported by this work. Ref. 11. Ref. 9. Ref. 15.
Observed broad resonances for which the three-photon resonance pathway is also suggested (see Table 1).
Proposed ionization pathway in which either one or two near-resonant levels with appropriate J and parity values have a large mismatch.
Tables (2)
Table 1
Suggested Three-Photon Ionization Pathways for Observed Single-Color Resonances in the Atomic-Uranium Spectrum
Difference between the calculated energy level and the known near-resonant level; a plus indicates that the calculated value is greater than the known near-resonant level, and a minus indicates that it is smaller.
Underlined J values are supported by this work.
Odd level proposed in this work.
Resonantly enhanced two-photon transition followed by a third photon ionization in which an intermediate even level, with appropriate J, has a large mismatch. Ref. 10. Ref. 11.
Resonantly enhanced two-photon transition followed by a third photon ionization for which the intermediate level is not, to our knowledge, given in the literature. Ref. 12. Ref. 13. Ref. 9. Ref. 14.
Table 2
Suggested Four-Photon Ionization Pathways for Some Observed Single-Color Resonances in the Atomic-Uranium Spectrum
Difference between the calculated energy level and the known near-resonant level; a plus indicates that the calculated value is greater than the known near-resonant level, and a minus indicates that it is smaller.
Underlined J values are supported by this work. Ref. 11. Ref. 9. Ref. 15.
Observed broad resonances for which the three-photon resonance pathway is also suggested (see Table 1).
Proposed ionization pathway in which either one or two near-resonant levels with appropriate J and parity values have a large mismatch.