Overall considerations on the quenching of PH2(A2A1) and new effects in collision-induced V-V energy transfer of PH2(X2B1; v2' ' = 1).
The quenching constants of PH2(A(2)A1; v2' = 0 and 1) by H(2)S, NH(3), COS, CHCl(3), and CH4 have been measured. Attempts to correlate these data and those published in previous papers due to other quenchers, with the molecular properties through the Parmenter and co-workers' theory, the Thayer and Yardley's model, and the collision complex formation theory have been made. Measurements of collision-induced deactivation constants of PH2(X(2)B1; v2' ' = 1) by COS, CHCl(3), and CH4 have also been carried out. A reliable linear relationship of the log values of V-V energy exchange probability with the minimum energy mismatch Deltanu between PH2(v2' ' = 1) and the quenchers has been shown. Effects on the V-V transfer efficiency by inversion doubling of NH(3) and by the degenerate vibrational modes of the quencher, which participate in the process, have been evidenced.
Xuan
Chieu Nguyen
CN
Istituto di Metodologie Inorganiche e dei Plasmi, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma 1, Via Salaria Km 29,300, 00016 Monterotondo Scalo (Roma), Italy. Chieu.NguyenXuan@imip.cnr.it