Abstract
We report term energies and effective quantum numbers of the odd parity 3d 2D→nf 2F series of lithium using multi-step and multi-photon laser excitation schemes. The experiments were performed using three dye lasers simultaneously pumped by the second harmonic (532nm) of a Q-switched Nd:YAG laser in conjunction with an atomic beam apparatus and thermionic diode ion detector. The first ionization potential of lithium has been determined as 43,487.13±0.02cm−1 from the much extended 3d 2D→nf 2F (17≤n≤70) series. In addition, the oscillator strengths of the 3d 2D→nf 2F (15≤n≤48) transitions have been determined, showing a decreasing trend with the increase in principal quantum number n.
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