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Velocity of a Molecule Evaporated from a Water Nanodroplet: Maxwell–Boltzmann Statistics versus Non‐Ergodic Events |
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| Authors: | Assist. Prof. Dr. Hassan Abdoul‐Carime Francis Berthias Dr. Linda Feketeová Dr. Mathieu Marciante Dr. Florent Calvo Dr. Valérian Forquet Prof. Dr. Henry Chermette Dr. Bernadette Farizon Prof. Dr. Michel Farizon Prof. Dr. Tilmann D. Märk |
| Affiliation: | 1. Université de Lyon, 69003 Lyon (France);2. Université Claude Bernard Lyon1, 69622 Villeurbanne (France);3. Institut de Physique Nucléaire de Lyon, CNRS/IN2P3 UMR 5822, 43 Bd du 11 novembre 1918, 69622 Villeurbanne Cedex (France);4. Institute Lumière Matière, CNRS, 69622 Villeurbanne (France);5. Université Grenoble 1, CNRS, LIPhy UMR 5588, 38041 Grenoble (France);6. Institut des Sciences Analytiques, CNRS UMR 5280, 43 boulevard 11 novembre, 69622 Villeurbanne Cedex (France);7. Institut für Ionenphysik und Angewandte Physik, Leopold Franzens Universit?t, 6020 Innsbruck (Austria) |
| Abstract: | The velocity of a molecule evaporated from a mass‐selected protonated water nanodroplet is measured by velocity map imaging in combination with a recently developed mass spectrometry technique. The measured velocity distributions allow probing statistical energy redistribution in ultimately small water nanodroplets after ultrafast electronic excitation. As the droplet size increases, the velocity distribution rapidly approaches the behavior expected for macroscopic droplets. However, a distinct high‐velocity contribution provides evidence of molecular evaporation before complete energy redistribution, corresponding to non‐ergodic events. |
| Keywords: | energy transfer mass spectrometry molecular dynamics velocity map imaging water |