NH3(ν2) inversion doubling and two-mode interaction of PH3(ν4,ν2) in V-V energy transfer with PH2(X˜2B1;v2″=1)

The collision induced deactivation constants of PH2(X˜2B1;v2″=1) by H2S and NH3 have been determined. The NH3 constant appears to be anomalously high with respect to other polyatomic quenchers data in V-V energy transfer with PH2(v2″=1). This deviation of the NH3 value has been ascribed to the inversion doubling of this molecule. The deactivation constant by PH3, determined in a previous work, has been re-examined. The removal of PH2(v2″=1) should be due to two PH3 vibrational modes, i.e., ν2 and ν4, and not to the single ν4, as formerly assumed, and their respective contributions have been estimated.