Abstract
AbstractElectron 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.
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