Halogenomethanes molecules fragmentation at interaction with ions
Smirnov O.V.1, Basalaev A.A.1, Kuz’michev V.V.1, Panov M.N.1, Simon K.V.1
1Ioffe Institute, St. Petersburg, Russia
Email: Oleg.Smirnov@mail.ioffe.ru

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The mechanism of fragmentation of isolated molecules of carbon tetrachloride CCl4 and the simplest chlorofluorocarbons CFC-12 (CCl2F2), CFC-13 (CClF3) at the single electron capture by H+, He2+ and Ar6+ ions keV energy has been studied. It is shown that the main process during the ionization of the molecules under study is the process of elimination of atomic chlorine. The formation of an undissociated molecular ion M+ is observed only for CF3Cl and CCl2F2 molecules, for which the process of elimination of atomic fluorine is significantly less probable than chlorine. The parameters of molecules and singly charged halogenomethane ions were calculated using the multiconfiguration method of self-consistent field in total active space (CASSCF). For the experimentally observed main channels of fragmentation of these ions, reaction paths are considered within the framework of the CASSCF method. Keywords: electron capture, chlorofluorocarbons, halogenomethane, fragmentation of molecular ions, mass spectrometry, multi-configuration self-consistent field method.
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