Collisional deactivation of laser excited singlet molecular oxygen by ozone

Publisher Website
Google Scholar
Abstract
The effect of small amounts of ozone (5–38 mm) on the rate of collisional deactivation of singlet molecular oxygen O2(1Δg) excited by means of laser radiation at 1.064 μ has been investigated. Due to the fact that high oxygen pressures were used (35 atm), the rate of deactivation of O2(1Δg) by collision with ground electronic state oxygen O2(3Σ−g) competes with deactivation by O3, a situation not encountered by previous investigators at much lower pressures. In the case of minimum O3 partial pressure (5 mm), the effect of O3 in direct deactivation of O2(1Δg) is negligible, with the controlling process being an intersystem crossing (electronic–vibration) O2(1Δg)(v′=0) →O2(3Σ−g)(v=5). Analysis of the data indicates that transfer of this large amount of vibrational energy to O3 en bloc must take place with high efficiency, producing O3 in a highly excited vibrational state lying just below the dissociation limit. Dependence of the overall deactivation rate of O2(1Δg) on O3 partial pressure exhibits a quadratic term in addition to the linear variation observed by other investigators at lower pressures. The effect of adding a third component (He, SO2, CO2, and NO2) with the ozone partial pressure held constant was also studied.

This publication has 24 references indexed in Scilit: