Inner shell excitation and dissociation of condensed formamide |
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| Institution: | 1. Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305-8568, Japan;2. Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan;3. High Energy Accelerator Research Organization, Oho, Tsukuba, Ibaraki 305-0801, Japan;1. Interdisciplinary Research Department – Field Science, ‘Alexandru Ioan Cuza’ University, Lascar Catargi 54, 700107 Iasi, Romania;2. BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany;3. National Institute of Research and Development for Technical Physics, Dimitrie Mangeron Bd. 47, 700050 Iasi, Romania;4. Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany;1. Dept. Geological Sciences, Jackson School of Geosciences, University of Texas, Austin, TX 78712, United States;2. University of Houston, Houston, TX, United States;3. University of Hawai''i, Honolulu, HI, United States;1. Department of Biochemistry and Molecular Pharmacology, Instituto de Parasitología y Biomedicina López Neyra, CSIC, PTS Granada, Avda. del Conocimiento, 17, 18016 Armilla, Granada, Spain;2. ARNA Laboratory, Université de Bordeaux, Inserm U1212, CNRS UMR5320, Institut Européen de Chimie Biologie (IECB), 2 Rue Robert Escarpit, 33607 Pessac, France;3. Institut Européen de Chimie et Biologie, Université de Bordeaux, CNRS & Inserm (IECB, UMS3033, US001), 2 rue Robert Escarpit, 33607 Pessac, France;4. Institute of Biophysics, AS CR, v.v.i. Kralovopolska 135, 612 65 Brno, Czech Republic |
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| Abstract: | Carbon and nitrogen K-shell excitation and dissociation of condensed formamide at 96 K were studied by near edge X-ray absorption fine structure (NEXAFS) recorded by total electron yield (TEY), total ion yield (TIY) and photon-stimulated desorption (PSD) yield of H+ measurements. It was found that electronic transitions from the C 1s or the N 1s to the σ1 (CH and/or NH) enhanced ion yields of H+ from the CH and/or NH functional groups. This selective dissociation indicates that the corresponding unoccupied molecular orbital has an antibonding character of the CH and/or NH. To investigate the molecular orientation of condensed formamide, incidence-angle-dependent TEY-NEXAFS spectra were measured. The CNO plane of the adsorbed formamide molecule is determined to be tilted away from the surface by an averaged angle of about 42°. |
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