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Two-photon ionization of helium for 23S and 21S states

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2 Author(s)
Sharma, R. ; University of Roorkee, Roorkee, India ; Mathur, K.

Two-photon ionization of He atom from its excited metastable 2^{3}S and 2^{1}S states is studied within the framework of the perturbation theory. Cross sections and ratios for circularly and linearly polarized laser light are obtained in the wavelength ranges 3180-3950 Å and 3650-5100 Å for 2^{3}S and 2^{1}S states, respectively. The effects of the quasi-resonant intermediate states and the states omitted in the truncated summation method are analyzed.

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Quantum Electronics, IEEE Journal of  (Volume:15 ,  Issue: 12 )