Abstract

We report the first observation of two-photon excitation from the n=1 to the n=3 level in hydrogen atoms. The process was detected by both laser-induced- fluorescence from the 656 ran Balmer α transition and two-photon resonant three-photon ionization. The excitation source used was a tunable argon-fluoride excimer laser1, which was frequency shifted via stimulated Raman scattering in D2.

© 1981 Optical Society of America

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