Yx. Gao et al., DEPENDENCE OF LEVEL-RESOLVED ENERGY-TRANSFER ON INITIAL VIBRATIONAL LEVEL IN LI(2)A(1)SIGMA(-NE COLLISIONS()(U)), The Journal of chemical physics, 104(4), 1996, pp. 1415-1426
We have investigated collision induced rotational and vibrational ener
gy transfer in the Li(2)A(1) Sigma(u)(+)(v(i), j(i)=30) -Ne system exp
erimentally under single-collision conditions at an effective temperat
ure of 691 K. Over 800 inelastic rate constants have been measured, wi
th the initial vibrational level v(i) ranging from 2 to 24 and -2 less
than or equal to Delta v+2. Increasing v(i) results in a linear incre
ase in the vibrational transition rate constants, which is accompanied
by a decrease in the rotationally inelastic transition rate constant.
The total inelastic rate constant increases with upsilon(i) only at t
he highest values of vi. Net vibrational energy transfer [Delta E] cal
culated using rotationally summed rate constants is qualitatively cons
istent with a simple model. However, explicit inclusion of rotation gi
ves quite different values of [Delta E]. The experimental results are
compared with our three-dimensional trajectory calculations on an ab i
nitio potential surface and on a simple repulsive potential surface. (
C) 1996 American Institute of Physics.