Calculations of laser induced quadrupole-quadrupole collisional energy transfer in Xe-Kr

A laser induced quadrupole-quadrupole collisional energy transfer system of Xe-Kr is proposed, and the threelevel laser induced collisional energy transfer (LICET) model is presented. Calculating results show that the peak of the LICET profile moves to the red and the FWHM becomes narrower, obviously with the laser field intensity increasing, while the resulting spectra is shifted in frequency toward the blue and the full width at half peak of the profile becomes larger as the relative velocity increases. The spectrum of the quadrupole-quadrupole LICET in the Xe-Kr system has a wider tunable range in an order of magnitude than the dipole-dipole LICET spectra. A cross section of 3:36 × 10^-15 cm² is obtained, which indicates that the quadrupole-quadrupole LICET process also can be an effective way to transfer energy selectively from a storage state to a target state.