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J. Phys. B: At. Mol. Phys. 16(1983) 2759-2771. Printed in Great Britain K2ground-state relaxation studies from transient process
 

Summary: J. Phys. B: At. Mol. Phys. 16(1983) 2759-2771. Printed in Great Britain
K2ground-state relaxation studies from transient process
kinetics
M P Auzin'sh, R S Ferber and I Ya Pirags
Latvian State University, 226098, Riga, USSR
Received 25 June 1982, in final form 15 March 1983
Abstract. Relaxation parameters of the optically depopi tel [U",J") 1 +
Eg level of the
Kz molecule with U" = 1 and J"=72 have been determined for thermal collisions with
He, Ne, Ar, Kr and Xe atoms, using the method of laser-induced fluorescence kinetic
monitoring. Rate constants of about lo-' cm3s-' and effective cross sections between
0.5 x and 1.6x cmzhave been obtained. Rectangular modulation of the He-Ne
laser 628.8 nm intensity, exciting the transition (1,72)X`E: + (8,72)B `nu,was employed
making it change periodically from depopulating to probing. The time dependence of the
probe-beam-induced fluorescence directly reflects the transient process restoring the
thermally equilibrated populations of the lower level (U",J").The kinetic equations were
solved in the classical-limit J"+ 00 approximation, allowing for participation of two
relaxation processes, namely collisions and collisionless exchange of molecules inside and
outside the laser beam in their thermal motion. It is shown that the assumption of additive
rates for both processes can lead to distortion of the concentration dependence of total

  

Source: Auzinsh, Marcis - Department of Physics, University of Latvia

 

Collections: Physics