Abstract
We report here the first measurements of the three-photon excitation spectrum of strontium using a Nd:YAG pumped dye laser in conjunction with an atomic beam apparatus as well as with a thermionic diode detector. The members of the 5s np 1 P 1 and 5s nf 1 F 3 Rydberg series converging to the first ionization threshold are observed. A dominating two-photon resonant three-photon ionization through the 5s6s 1 S 0 level of strontium lying adjacent to the three photon ionization threshold restricted the observation of the higher Rydberg members.
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