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Velocity of a Molecule Evaporated from a Water Nanodroplet: Maxwell–Boltzmann Statistics versus Non‐Ergodic Events
Author(s) -
AbdoulCarime Hassan,
Berthias Francis,
Feketeová Linda,
Marciante Mathieu,
Calvo Florent,
Forquet Valérian,
Chermette Henry,
Farizon Bernadette,
Farizon Michel,
Märk Tilmann D.
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201505890
Subject(s) - ergodic theory , excitation , maxwell–boltzmann distribution , chemistry , redistribution (election) , molecule , molecular physics , chemical physics , physics , atomic physics , quantum mechanics , plasma , mathematical analysis , mathematics , politics , political science , law , organic chemistry
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.