Abstract
We present new data on the high Rydberg states of thallium using the resonance enhanced multi-photon excitation and ionization techniques in conjunction with a thermionic diode ion detector. The Rydberg states 6 s 2 n p 2 P 1/2 (7⩽ n⩽29), 6 s 2 n p 2 P 3/2 (7⩽ n⩽35) and 6 s 2 n f 2 F 5/2 (5⩽ n⩽48) have been observed via two-photon excitation from the ground state. The 6 s 2 n p 2 P 1/2,3/2 multiples due to spin–orbit interaction are resolved up to n=29. The observed energy separations among the multiplets are in excellent agreement to the calculated values using the valence electron model. The 6 s 2 n f 2 F 5/2 series have been observed up to n=48 for the first time. The first ionization potential of thallium has been derived as 49266.5(1) cm −1 which is in good agreement to the earlier work.
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