Abstract
The 5p 2P 3 2 − np 2P 1 2 , 3 2 two-photon transitions in neutral indium, with 25 ⩽ n ⩽ 43, have been studied by using a pulsed dye laser. The fine structure of the upper levels has been resolved for the first time and shows a hydrogenic behaviour over the series. The accurately determined quantum defects confirm the value of the ionization limit, 46670.107 cm -1, derived previously from the 2S series. Discrepancies between our results and those obtained in earlier investigations are discussed. The relation predicted by theory between the two-photon transition probability and the energy difference between the real and the virtual intermediate level has been verified experimentally.
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