Collision induced deactivation of PH2(Ã 2A1;v2′=1,0) and PH2(X̃ 2B1;v2″=1) by diatomic molecules

Abstract

Deactivation of the bending mode v2′=1 and v2′=0 vibrational levels of PH2(Ã 2A1), and of the v2″=1 level of ground state PH2(X̃ 2B1) due to collisions with the diatomic molecules H2, N2, CO, and NO has been investigated. The Parmenter and co-worker’s, the Thayer and Yardley’s, and the collision complex theories have been used to rationalize the PH2(Ã 2A1) quenching data. Explanations for the deviations of the quenching data due to these molecular quenchers from the variation trend found, in a previous work, for the rare gas quenchers have been proposed. For the vibrational relaxation of PH2(X̃ 2B1;0,1,0), the data interpretation is based essentially on the theories by Schwartz, Slawsky, and Herzfeld–Tanczos, and Moore.