Calculation of laser induced collisional energy transfer in the Sr-Ca system

Based on the four-state model of laser-induced collisional energy transfer, the cross section of the collisional energy transfer in the Sr-Ca system is obtained. Various factors, including field intensity, relative speed, and temperature, which influence the collisional cross section, are discussed for illustrating the features of the Sr-Ca laser-induced collisional energy transfer (LICET) process. The calculated results show that the LICET spectral profiles obviously become narrower when the laser field intensity increases. The collision cross section rises with laser intensity and tends to saturate. In the vicinity of the spectral profile center, the cross section at fixed laser detuning becomes smaller as the relative speed and system temperature increase. The results indicate that the intermediate states strongly affect the spectral profile of LICET.