Studies of the fragmentation of the monocation and dication of methanol.
J CHEM PHYS
, Article 224305. 10.1063/1.3266940.
Relative partial ionization cross sections and precursor-specific relative partial ionization cross sections for fragment ions formed by electron ionization of methanol have been measured using time-of-flight mass spectrometry coupled with a two-dimensional ion coincidence technique. Relative cross sections are reported for ionizing energies from 30 to 200 eV. Good agreement is found between our data and one set of recently published absolute partial ionization cross sections. Conversely, discrepancies are observed with another set of recently published data; we attribute these discrepancies to the loss of translationally energetic fragment ions. Our precursor-specific cross sections allow the contribution from single and double ionization to the individual fragment ion yields, following ionization of methanol, to be quantified for the first time. Our analysis shows that the contribution of double ionization to the total ion yield reaches a maximum of 20% between 150 and 200 eV.
|Title:||Studies of the fragmentation of the monocation and dication of methanol|
|Keywords:||electron impact dissociation, electron impact ionisation, molecule-electron collisions, organic compounds, positive ions, time of flight mass spectra, ELECTRON-IMPACT IONIZATION, DOUBLY-CHARGED IONS, CROSS-SECTIONS, DISSOCIATIVE IONIZATION, DOUBLE PHOTOIONIZATION, ORGANIC-MOLECULES, CF4, PHOTODISSOCIATION, COINCIDENCE, DYNAMICS|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
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