Cd. Ball et Fc. De Lucia, Direct observation of Lambda-doublet and hyperfine branching ratios for rotationally inelastic collisions of NO-He at 4.2 K, CHEM P LETT, 300(1-2), 1999, pp. 227-235
A 4.2 K collisionally cooling cell and time-resolved millimeter-wave/millim
eter-wave double resonance have been used to directly measure the Lambda-do
ublet and hyperfine branching ratios and absolute cross-sections of rotatio
nally inelastic collisions of NO-He. The data were analyzed in the context
of angular momentum recoupling, which is based on the 'spectator' role of t
he nuclear spin in the collision, and tensor opacities, which characterize
the electrostatic collision. The propensities expected for the approximatel
y homonuclear NO (the largest of which is the e/f symmetry conserving, Delt
a J = 0 rate) were observed and the four K = 1 tensor opacities measured. (
C) 1999 Elsevier Science B.V. All rights reserved.