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Abstract
New experimental data on the highly excited Rydberg states of lithium have been acquired, using a two-step laser excitation technique in combination with a thermionic diode ion detector. The atoms are prepared in the 3s 2S1/2 intermediate level by two-photon excitation from the ground state, whereas the np 2P1/2,3/2 levels have been approached via single photon absorption. The new observations include much extended np 2P1/2,3/2 Rydberg series (15 ⩽ n ⩽ 60). The Rydberg relation fit to the new data yields the quantum defect for the np 2P1/2,3/2 series as 0.051(4) and the binding energy of the 3s 2S1/2 level as 16 281.19(2) cm−1. Adding the energy of the 3s 2S1/2 level and its binding energy reveals the first ionization potential of lithium as 43 487.26(3) cm−1.
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Schedule a callMore From: Journal of Physics B: Atomic, Molecular and Optical Physics
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