Abstract
Spectroscopic studies of highly excited Rb atoms were performed with continuously tunable coherent extreme-ultraviolet radiation generated by four-wave mixing in Kr and Xe. The excitation energy of the core-excited state 4p55s2 2P3/2 and the absorption cross section for the transition from the ground state to the excited state were measured to be 123497.5 ± 0.5 cm−1 and (2.1 ± 0.6) × 10−16 cm2 at the absorption peak, respectively; the oscillator strength for the transition and the excited-state lifetime for autoionization were also determined. Absorption measurements were made for the transition from the low-lying excited state 5p 2P3/2 to the quasi-metastable quartet state 4p55s5p4S3/2, which yielded the excitation energy, 134250.2 ± 0.5 cm−1, of the quartet state.
© 1991 Optical Society of America
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