Relaxation of individual rotational levels of the Ã1Au electronic state of acetylene excited to the 2ν3′ and (ν1′+ν3′+ν6′) vibrational modes Original Research Article

Collisionless and collisional (self-quenching) rate constants were measured for several rotational states of the V21K01 and V21K21 subbands of acetylene under bulk conditions. For jet-cooled acetylene, the collisionless decay rates measured for the 1161V16K10 subband are larger than those for the V21K01 and V21K21 subbands. The present results are compared with the kinetic data available from the literature. The differences observed among the collisionless rate constants as a function of vibro-rotational energy are explained in terms of non-radiative processes in acetylene.