Abstract
We present a comparison of the photoionization cross sections of the 4d D 3 / 2 , 5 / 2 2 excited levels of sodium by using the two-step resonant laser excitation and by two-photon non-resonant excitation from the ground state. Dye lasers, pumped with a Nd: YAG laser, have been used in conjunction with a thermionic diode ion detector to measure cross sections and the atomic densities as a function of laser energy. By applying the saturation technique, the measured values of the cross sections and atomic densities for the 4d D 5 / 2 2 level by two-photon excitation are 12.2(2.4) Mb and 6.7 × 10 10 cm - 3 , respectively. Where as in the case of two-step excitation, the cross section and number density for the 4d D 3 / 2 2 level via 3p P 1 / 2 2 level and for the 4d D 3 / 2 , 5 / 2 2 levels via 3p P 3 / 2 2 level are determined as 9.6(1.9) Mb, 4.1 × 10 10 cm - 3 and 12.8(2.5) Mb, 3.7 × 10 10 cm - 3 , respectively.
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