Dynamics of Vibrational Relaxation of Multiphoton Excited SF6 Molecules in Gaseous Mixtures Containing Ozone and Inert Gases (He, Ar, Kr)

SF6 at pressure of 0.6 Torr in gas mixtures with ozone (0 ÷ 5 Torr) and inert gases: He, Ar, Kr (0 ÷ 5 Torr) was vibrationally excited with and IR pulsed radiation of CO2 TEA laser at 10P20 laser line (F= 0.6 J/cm2). The vibrational energy transfer from multiphoton excited (MPE) molecules SF6 to the components of gaseous mixture was probed by UV absorption of ozone at λ = 253.6 nm band. The relaxation process of MPE molecules SF6 was proposed to occur through parallel V-V' and V-T collisional channels. Based on the kinetic model, collisional rate constants were determined from the time evolution of UV absorption data after laser shot. The obtained values of relaxation rate constants are: KV−VSF6−O3=7.7, 10−13 cm3/s, KV-TSF6−He=3.1 10−13cm3/s, KV−TSF6−Ar=2.3 10−13 cm3/s, KV−TSF6−Kr=7.7 10−14 cm3/s, KV−TSF6−SF6=(4.8÷6.4) 10−13 cm3/s.