β Scribed by M.R. Bruce; Ce Ma; R.A. Bonham
No coin nor oath required. For personal study only.
In electron impact dissociative ionization of CF4, using a time-of-flight apparatus, four cation pair coincidences have been observed between F Γ· ions and the fragment ions: CFf, CF~, CFΓ·, and CΓ·. Absolute cross sections and thresholds for cation pair production from the fragmentation of CF4 are reported for electron impact energies from threshold to 500 eV, with the ion pair cross sections found to contribute up to 13% to the gross ionization cross section. Also, corrections are applied to recently reported partial ionization cross section data for CF4, from which the true ion counting cross sections are computed for the first time; as well, bounds are placed on the production of neutral fluorine for electron impact energies from 20-500 eV.
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The dissociative ionization of sulphuryl fluoride (SO,F,) under electron impact has been examined by using a trochoidal electron velocity selector and a magnetic sector mass spectrometer. The ionization efficiency curves of SO,F:, SOF:, SO,F+ and SOF+ have been recorded and the appearance energies o
An apparatus containing cross nlolecular and pulsed electron beams has been used to obtain distributions in kinetic cncryy 2nd angle of fast ( ,> 0.5 cV) positive ions producrd through dissociative ionization of N2 and 0, by impact of 50 to 200 cV electrolls. Four m;lin 0' ion groups arc observed w