Vibrational relaxation of NO+ (<i>v</i>) ions in neutral collisions

Abstract

Vibrational relaxation of NO+ (v) by collisions with NO, N2, CO2, CH4, NO2, He, Ar, and Kr has b een measured from thermal energy up to 1 eV. NO+ (v) is vibrationally relaxed at near the collision frequency by resonant charge transfer with NO. N2 is quite efficient due to near resonant V → V transfer. CO2, CH4, and NO2 are efficient, Ar, Kr, and especially He are not. The quenching rate constants for N2, CO2, and CH4 decrease with KE, those for NO and NO2 do not.