کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1409448 1501783 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vibrational excitation of adsorbed molecules by low-energy photon-emitted electrons: A dynamical model
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Vibrational excitation of adsorbed molecules by low-energy photon-emitted electrons: A dynamical model
چکیده انگلیسی

A simple, inelastic electron-scattering dynamical model is presented to account for vibrational excitation in molecular adsorbates. The basic two ingredients of the theoretical model are: (i) the conservation of the total angular momentum, and (ii) the requirement of a critical time to allow for the intra-molecular energy re-arrangement of the transient negative-ion complex. The model is applied to the vibrational excitation dynamics of molecules chemisorbed at sub-monolayer conditions on ordered metal surfaces. This was exemplified for Acrylonitrile adsorbed on Cu(1 0 0), whose vibrational excitation was studied via energy loss spectra of low-energy two-photon photoemission (2PPE) electrons, and for ammonia (NH3 and ND3) adsorbed on Cu(1 0 0), being probed in a STM experiment. Fits of the model to the data allowed for deducing the energy threshold of the vibrational excitation of the CC and CN bonds of the ACN adsorbate molecules, and the threshold for the symmetric ν1-stretch mode excitation of adsorbed NH3/ND3. Also, information about the temporal dynamics underlying the inelastic electron scattering was gained.


► Inelastic electron-scattering model for vibrational excitation in adsorbed molecules.
► The model includes the conservation of the total angular momentum.
► The model incorporates a critical time for vibrational excitation of the adsorbate.
► The model was applied to Acrylonitrile and ammonia chemisorbed on Cu(1 0 0).
► Energetic and dynamical information on the electron–adsorbate inelastic scattering.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1031, 16 January 2013, Pages 61–69
نویسندگان
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