Velocity of a Molecule Evaporated from a Water Nanodroplet: Maxwell–Boltzmann Statistics versus Non‐Ergodic Events. Issue 49 (16th October 2015)

• Record Type: Journal Article
• Authors: Abdoul‐Carime, Hassan; Berthias, Francis; Feketeová, Linda; Marciante, Mathieu; Calvo, Florent; Forquet, Valérian; Chermette, Henry; Farizon, Bernadette; Farizon, Michel; Märk, Tilmann D.
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 49(2015)
• Page Start: 14685
• Page End: 14689
• Publication Date: 2015-10-16
• Subjects: energy transfer -- mass spectrometry -- molecular dynamics -- velocity map imaging -- water; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201505890
• Languages: English
• ISSNs: 1433-7851

Abstract

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. Abstract : The velocity of molecules evaporated from a mass‐selected protonated water nanodroplet is measured event by event using velocity map imaging in combination with a mass spectrometry technique. Besides the Maxwell–Boltzmann (MB) statistics behavior, a distinct high‐velocity contribution provides evidence of molecular evaporation before complete energy redistribution, corresponding to non‐ergodic events.