Ion–molecule Reactions Studied by Time-of-Flight Mass Spectrometry

Abstract

not available

ION–MOLECULE REACTIONS STUDIED BY TIME-OF-FLIGHT MASS SPECTROMETRY: II. REACTIONS IN CO–D2 AND CH4–D2 MIXTURES

“…The ioilization efficiency curve of the species DCO+ was found to be identical with that of CO+; in particular there was no structure in the DCO+ curve corresponding to the onset of D2+. Thus we conclude that under the conditions of our experiment the reactant ion is CO+, and that [4] does not contribute appreciably to the formation of DCO+. With the reaction system thus simplified, the kinetic equations may again be integrated to …”

“…In view of the increasing interest in the role of ions in combustion processes (3), it is desirable to have available kinetic data which are obtained with ions reacting a t thermal velocities in the absence of external electric fields. These conditions are met in a new method which has been briefly reported (4). An additional advantage of this method is that the measured kinetic variable is time, rather than the less direct variables of reservoir pressureor electric field.…”

Radiation chemistry and mass spectrometry of silanes and germanes. Progress report, June 1, 1972--May 31, 1973

“…diameter tubing to the ion-source. The pressure-dependent formation of CHs , which occurs in CH4 -CH4 collisions with a known specific reaction rate, indicated the pressure'readings to be accurate to within [9][10][11][12] t10%·…”

“…17 3 The mass spectrum of the mixtures irradiated to a dose of 17 3 9.4x 10 ev/cm from m/e 36 -m/e 139 is shown in Figure 1 where it is compared with the mass spectra of pure samples of Si2H61, SiH30SiH32, SiH305iH20SiH32 and (SiH3O)3SiH2. It is clear that the above four compounds-account completely for the radiolysis product (other than H2).…”

Ion-molecule reactions in monosilane-acetylene mixtures

“…In this investigation, which was carried out in a single-source mass spectrometer, reaction identification was made principally on the basis of appearance potential measurements of product ions and rate [3][4][5] constants were determined by the pulse technique for ion-source pressures below 0.006 torr.…”