학술논문
Isotope effects in dynamics of water isotopologues induced by core ionization at an x-ray free-electron laser
Document Type
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, M. N.
Source
Structural Dynamics. 10(5)
Subject
Language
English
ISSN
2329-7778
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.