Mechanisms of metastable N2 and Kr electron stimulated desorption from N2---Kr double layer and mixed films |
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Authors: | H. Shi P. Cloutier J. Gamache L. Sanche |
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Affiliation: | Groupe du Conseil de Recherches Medicales en Science des Radiations, Faculté de Médecine. Université de Sherbrooke., Sherbrooke, Qc, Canada J1H 5N4 |
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Abstract: | Desorption of metastable particles from layered and mixed films, composed of N2 and Kr, is induced by the impact of 6–50 eV monoenergetic electrons. From yield functions and time-of-flight analysis of the metastable particles emanating from these films, N*2 and Kr* are identified as the desorbing species. Basic mechanisms responsible for their desorption are discussed. It is suggested that the desorption of Kr* arises from dissociation of transitory [Kr·N2]* excimers. The desorption of N*2 can arise from cavity expulsion, intramolecular vibrational energy transfer (with or without prior electronic excitation energy transfer from Kr excitions to N2) and the dissociation of [Kr·N2]* excimers. |
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Keywords: | Electron stimulated desorption Krypton Nitrogen |
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