Photoinduced intermolecular dynamics and subsequent fragmentation in VUV-ionized acetamide clusters
| Autor: | Marta Tarkanovskaja, Kuno Kooser, H. Levola, Edwin Kukk, Ergo Nõmmiste |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010304 chemical physics
ta114 Hydrogen bond Dimer Photodissociation Intermolecular force General Physics and Astronomy Photoionization 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Fragmentation (mass spectrometry) Intramolecular force 0103 physical sciences Physical and Theoretical Chemistry Acetamide |
| Zdroj: | Journal of Chemical Physics. 145(12) |
| ISSN: | 0021-9606 |
| Popis: | Photofragmentation of small gas-phase acetamide clusters (CH3CONH2)n (n ≤ 10) produced by a supersonic expansion source has been studied using time-of-flight ion mass spectroscopy combined with tunable vacuum-ultraviolet (VUV) synchrotron radiation. Fragmentation channels of acetamide clusters under VUV photoionization resulting in protonated and ammoniated clusters formation were identified with the discussion about the preceding intramolecular rearrangements. Acetamide-2,2,2-d3 clusters were also studied in an experiment with a gas discharge lamp as a VUV light source; comparison with the main experiment gave insights into the mechanism of formation of protonated acetamide clusters, indicating that proton transfer from amino group plays a dominant role in that process. Geometry of the acetamide dimer was discussed and the most stable arrangement was concluded to be achieved when subunits of the dimer are connected via two N-H⋯O -C hydrogen bonds. Also, the influence of the photon energy on the stability of the clusters and their fragmentation channels has been examined. |
| Databáze: | OpenAIRE |
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