Dissociation of alkane ionized molecules |
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Authors: | V V Afrosimov L A Baranova A A Basalaev M N Panov O V Smirnov and A V Tulub |
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Institution: | 1.Ioffe Physico-Technical Institute,Russian Academy of Sciences,St. Petersburg,Russia;2.St. Petersburg Physicotechnological Research and Educational Center,Russian Academy of Sciences,St. Petersburg,Russia;3.St. Petersburg State University (Petrodvorets Branch),Petrodvorets, St. Petersburg,Russia |
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Abstract: | The subject of investigation is the fragmentation of variously charged molecular ions arising in col-lisions of several kiloelectronvolt
H+, He2+, and Ar6+ ions with molecules of the simplest alkanes (from methane to butane). Using the method of time-of-flight mass spectrometry,
the formation cross sections of dissociation-induced fragment ions are measured. The dissociation takes place when an incident
ion captures an electron from a methane, ethane, or propane molecule. The role of additional ionization of the molecule, which
accompanies the electron capture by the incident ion, is elucidated. The kinetic energy spectrum for protons resulting from
the fragmentation of multiply charged alkane ions is determined. The most plausible kinetic energies of protons depending
on the degree of ionization and molecule size fall into the range 1–25 eV. It is shown that, when the molecule loses several
electrons, the kinetic energies of protons are governed by Coulomb interaction between all fragment ions and are determined
by their flying apart from the relative spatial arrangement of corresponding atoms in a parent molecule. |
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