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Electron impact ionization of H 2 O ice
Author(s) -
Safvan C. P.,
Raheja U. T.,
Mathur D.
Publication year - 1993
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290070713
Subject(s) - chemistry , electron ionization , ionization , quadrupole mass analyzer , mass spectrometry , electron , foil method , atomic physics , thermal ionization , collimated light , secondary electrons , analytical chemistry (journal) , ion , optics , physics , nuclear physics , laser , materials science , organic chemistry , chromatography , composite material
Electron impact ionization and dissociative ionization of water in vapour and ice form has been studied using a newly developed apparatus comprising a well‐collimated beam of 700 eV electrons, a cryogenic target assembly and a quadrupole mass spectrometer. The target assembly consists of a liquid‐nitrogen cooled nickel foil upon which a thin layer of ice is formed. Comparison of the vapour‐phase mass spectrum with that obtained in the ice phase reveals significant differences in the dissociative ionization pattern which are of significance in modelling studies of cold astrophysical environments.