Premium
Dissociative ionization of the H 2 O molecule bombarded by swift singly charged and slow highly charged ions
Author(s) -
Kovács Sándor T.S.,
Herczku Péter,
Juhász Zoltán,
Sarkadi László,
Gulyás László,
Chesnel Jean Yves.,
Ábrók Levente,
Frémont Francois,
Hajaji Anas,
Sulik Béla
Publication year - 2019
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.3072
Subject(s) - fragmentation (computing) , ion , ionization , atomic physics , electron ionization , coulomb explosion , molecule , spectral line , chemistry , electron capture , physics , organic chemistry , astronomy , computer science , operating system
Fragment ion energy spectra of the water molecule have been measured in conventional crossed‐beam experiments by the impact of 46 keV/u energy, singly charged ions (SCIs) and 4.3 keV/u energy, highly charged ions (HCIs). Double differential cross sections have been determined and a comparative analysis has been performed. We found that the fragmentation spectra for SCIs and HCIs are very similar, indicating that both collisions lead to the same fragmentation channels. This suggests that the Coulomb explosion of the water molecule is dominantly determined by the charge state of the transient molecular ions, and it is almost independent from the primary ionization mechanism. Differences were observed not only between the SCI and HCI impact‐induced fragmentation cross sections, but between those obtained by the 60 keV N 6+ and 70 keV O 7+ projectiles. The differences were attributed to the selectivity of the electron capture process for HCIs. Multiple target ionization cross sections have been deduced from the fragment ion spectra. We found contributions of up to fivefold ionization for SCIs and up to sixfold ionization for HCIs.