H. Shi et al., MECHANISMS OF METASTABLE N-2 AND KR ELECTRON-STIMULATED DESORPTION FROM N-2-KR DOUBLE-LAYER AND MIXED FILMS, Surface science, 380(2-3), 1997, pp. 385-396
Desorption of metastable particles from layered and mixed films, compo
sed of N-2 and Kr, is induced by the impact of 6-50 eV monoenergetic e
lectrons. From yield functions and time-of-flight analysis of the meta
stable particles emanating from these films, N-2 and Kr* are identifi
ed as the desorbing species. Basic mechanisms responsible for their de
sorption are discussed. It is suggested that the desorption of Kr ari
ses from dissociation of transitory [Kr-N-2] excimers. The desorption
of N-2 can arise from cavity expulsion, intramolecular vibrational e
nergy transfer (with or without prior electronic excitation energy tra
nsfer from Kr excitons to N-2) and the dissociation of [Kr-N-2] excim
ers. (C) 1997 Elsevier Science B.V.