Abstract

The kinetics of two-step photoionization of barium atoms through excited levels was studied by numerical simulation method in the optically dense approximation. The first laser at wavelength nm ( nm) pumps transition (). The second laser with nm ( nm) ionizes atoms from the level (). The third probe laser with wavelength nm causes resonant fluorescence of barium ions. It is shown that the metastable from the triplet in barium is strongly populated through levels. Therefore, the applying of the ionizing laser tuned to a continuum from this metastable can yield a significant increase in the ionization efficiency. The laser-induced fluorescence method makes it possible to estimate the photoionization yield of barium ions with an error of up to 8%. The loading rate of the barium ion beam into the ion trap, obtained numerically, is consistent with the experimental data [Opt. Exp. 19(17), 16438 (2011)]. The deceleration of ultracold plasma recombination due to the heating of electrons in superelastic collisions for the characteristic times of a two-stage process is predicted.

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