| Collisional energy transfer between the excitation states of alkali molecules and the ground states of alkali atoms have been studied both theoreticially and experim- entially. Therefore domestic and international authors are very great interest of them, In molecule dissociation , predissociation and fine structure changing energy and so on ,the atom-atom and atom-molecule interaction potentials and nonadiabatic coupl- ing play a interesting thing .Especially in recent years, people produce very great interest to the predissociation of alkali molecules,which have developed in laser chemistry , laser physics, new-model laser system and laser isotope separation , because it is a parent mechanicsm for producing excited atoms.In the present work, we focus on studying three processes and obtain collisions cross sections and rate coefficients by the technique of laser induce fluorescence spectroscopy .(1) Cs(6P3/2)+Cs(6P3/2)→Cs(6DJ)+Cs(6S)+876～833cm-1The temperatures of the cesium vapor is in the ranges 373k to 393K, the EP coll- isions cross sections for nlJ being 6D5/2 and 6D3/2 are (4.1±1.8)×10-15 and(2.2±1.0)×10-15cm2 , respectively.(2) Cs(6S) + N2 +hv→Cs(6P)+N2Cs ( 62 P3/2)+ Cs(6S1/2)?Cs(62P1/2)+Cs(6S1/2)The temperatures of the Cs-N2 vapor mixture is 333k,the fine structure changing cross sections of Cs(6P1/2→6P3/2) and Cs(6P3/2→6P1/2) is 5.13×10-19 and 2.78×10-18 cm2, respectively.(3) Cs(6P3/2)+Cs(6P3/2)+He+△E→Cs(nlJ)+Cs(6S1/2)+HeThe temperatures of the Cs-He vapor mixture are in the ranges 330k to 340k,the three-body collisions rate coefficients (in units of 10-27cm6s-1)for nlJ being 8S1/2,4F7/2 and 4F5/2 are 1.80±0.72,1.28±0.51 ,2.23±0.89, respectively.These results have been discussed in relation to those of other experiments. For we consider the effects of EP collisions, Rayleigh emission in processing experiments ,the experimental date that we extract is fairly veracious. |
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