J. Phys. II France
Volume 3, Numéro 4, April 1993
Page(s) 465 - 476
DOI: 10.1051/jp2:1993144
J. Phys. II France 3 (1993) 465-476

Angular dependence of vibrational excitation in Li + + N 2, CO collisions at medium energies

C. Benoit and D. Dhuicq

Laboratoire des Collisions Atomiques et Moléculaires, Université Paris-Sud, Bât. 351, 91405 Orsay Cedex, France

(Received 9 October 1992, accepted in final form 23 December 1992)

We have measured the vibrational populations of N 2(X) and CO(X), produced by Li + projectiles, at collision energies $100\leqslant E\leqslant 500$ eV as a function of the scattering angle. Though vibrational excitation is a weak process in the angular range studied, it is found to strongly vary with the angle. Other inelastic processes such as charge exchange or electronic excitation are negligible. A theoretical model developed previously to describe vibrational excitation in this energy range is applied to the considered collisional systems. The reasonable agreement with experiment thus obtained shows that the observed vibrational excitation results only from ground state interactions.


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