Pl. James et al., TOTAL AND STATE-TO-STATE RATE COEFFICIENTS FOR ROTATIONAL ENERGY-TRANSFER IN COLLISIONS BETWEEN NO(CHI(2)PI) AND HE AT TEMPERATURES DOWN TO15 K, Chemical physics letters, 272(5-6), 1997, pp. 412-418
Infrared-ultraviolet double resonance (IRUVDR) experiments have been i
mplemented in the ultra-cold environment provided by a CRESU (Cinetiqu
e de Reaction en Ecoulement Supersonique Uniforme) apparatus. This has
enabled us to measure rate coefficients for rotational energy transfe
r in collisions between NO and He of two kinds: those relating to tota
l removal from a specific rovibrational state of NO(X (2) Pi; Omega =
1/2; upsilon = 3; J = 0.5, 3.5 or 6.5) and also state-to-state rate co
efficients for transfer from these levels. Using different Laval nozzl
es, results have been obtained at four different temperatures: 149, 63
, 27 and 15 K, and are also reported for 795 K. (C) 1997 Elsevier Scie
nce B.V.