Electron impact overtone excitation via the 2Σu resonance in N2 films physisorbed on Ag(110) at 15 K

F. Bartolucci, R. Franchy, Jorge Carvalho da Silva, A. M. C. Moutinho, D. Teillet-Billy, J. P. Gauyacq

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Abstract

The growth and structure of solid nitrogen films on Ag(110) at 15 K was investigated by means of high resolution electron energy loss spectroscopy (EELS), thermal desorption spectroscopy (TDS). and low energy electron diffraction (LEED). The N2 film exhibits a parallelogram structure in the monolayer. For the bilayer and multilayers an incoherent hexagonal structure has been found. The dynamics of the resonant vibrational excitation of the N2 molecule via the 2Σu resonance is studied in detail both by the EELS method (as a function of the surface coverage) and theoretically. This allows a discussion of the effect of the adsorption on the vibrational excitation process and, in particular, on the overtone excitation. The 2Σu resonance excitation process is found to be almost not influenced by the adsorption in strong contrast with the case of the low energy (2IIg) N2 resonance. The differences between these two processes are discussed.

Original languageEnglish
Pages (from-to)2251-2260
Number of pages10
JournalJournal of Chemical Physics
Volume108
Issue number5
DOIs
Publication statusPublished - 1 Feb 1998

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