Laser-induced collisional-energy transfer in thermal collisions of lithium and strontium

Abstract

Fluorescence of Li excited by laser light and simultaneous thermal ${\mathrm{Sr}}^{\mathrm{*}}$ collisions in the reaction Sr(5p)+Li(2s)+\ensuremath{\Elzxh}\ensuremath{\omega} (\ensuremath{\lambda}=669.8 nm)\ensuremath{\rightarrow}Sr(5${s}^{2}$)+Li(4d) shows an asymmetric excitation spectrum of the energy transfer versus \ensuremath{\lambda}. The peak variation with light intensity demonstrates the strong-field regime and verifies current models. A change in the slope of the quasistatic wing agrees with the result of a recent three-level model.