학술논문
Isotope effects in dynamics of water isotopologues induced by core ionization at an x-ray free-electron laser
Document Type
article
Author
Guillemin, R; Inhester, L; Ilchen, M; Mazza, T; Boll, R; Weber, Th; Eckart, S; Grychtol, P; Rennhack, N; Marchenko, T; Velasquez, N; Travnikova, O; Ismail, I; Niskanen, J; Kukk, E; Trinter, F; Gisselbrecht, M; Feifel, R; Sansone, G; Rolles, D; Martins, M; Meyer, M; Simon, M; Santra, R; Pfeifer, T; Jahnke, T; Piancastelli, MN
Source
Structural Dynamics. 10(5)
Subject
Language
Abstract
Dynamical response of water exposed to x-rays is of utmost importance in a wealth of science areas. We exposed isolated water isotopologues to short x-ray pulses from a free-electron laser and detected momenta of all produced ions in coincidence. By combining experimental results and theoretical modeling, we identify significant structural dynamics with characteristic isotope effects in H2O2+, D2O2+, and HDO2+, such as asymmetric bond elongation and bond-angle opening, leading to two-body or three-body fragmentation on a timescale of a few femtoseconds. A method to disentangle the sequences of events taking place upon the consecutive absorption of two x-ray photons is described. The obtained deep look into structural properties and dynamics of dissociating water isotopologues provides essential insights into the underlying mechanisms.