T. Lenzer et K. Luther, INTERMOLECULAR POTENTIAL EFFECTS IN TRAJECTORY CALCULATIONS OF COLLISIONS BETWEEN LARGE HIGHLY EXCITED MOLECULES AND NOBLE-GASES, The Journal of chemical physics, 105(24), 1996, pp. 10944-10953
Quasiclassical trajectory calculations have been applied to study inte
rmolecular potential effects in the collisional deactivation of highly
vibrationally excited aromatic molecules by noble gases. For benzene
+ helium and benzene + argon several potential functions of Lennard-Jo
nes 12-6 and EXP-6 type were used. At low well depths epsilon (for ben
zene + helium) energy transfer is dominated by the exact shape of the
intermolecular potential, especially of the repulsive part, whereas th
e dependence on E itself is less important. At higher well depths (for
benzene + argon) the energy transfer parameters [Delta E] and [Delta
E(2)] scale with epsilon and are much less sensitive to details of the
interaction. New potential parameters based on experimental scatterin
g data for the benzene + helium system are presented, which provide ve
ry good agreement with experimental energy transfer parameters for the
deactivation of benzene and azulene by helium. (C) 1996 American Inst
itute of Physics.