منابع مشابه
State-selected ion-molecule reactions: Statistical calculations with constraints
For the two reactive systems, NH 3 ϩ (E int)ϩN H 3 →NH 4 ϩ ϩNH 2 and H 2 ϩ (E int)ϩH 2 →H 3 ϩ ϩH, for which the relative cross sections were measured earlier in our group for E c.m. Ϸ40 meV we calculated the relative cross section as a function of internal energy using the statistical Rice– Ramsperger–Kassel–Marcus ͑RRKM͒ theory that implicitly conserves total energy and total angular momentum. W...
متن کاملAdiabatic and diabatic invariants in ion-molecule reactions.
A point charge interacting with a dipole (either induced or permanent) constitutes a completely integrable dynamical subsystem characterized by three first integrals of the motion (E, p(phi), and either l(2) or a Hamilton-Jacobi separation constant beta). An ion-molecule reaction (capture or fragmentation) can be seen as an interaction between such a subsystem and a bath of oscillators. This in...
متن کاملIon-molecule reactions reveal facile radical migration in peptides.
Ion-molecule reactions between molecular oxygen and peptide radicals in the gas phase demonstrate that radical migration occurs easily within large biomolecules without addition of collisional activation energy.
متن کاملDeuterium Fractionation and Ion-Molecule Reactions at Low Temperatures
Understanding deuterium fractionation is currently one of the greatest challenges in astrochemistry. In this contribution deuteration experiments of the series CHn , n = 2–5, in a low temperature 22-pole ion trap are used to systematically test a simple chemical rule predicting which molecular ion undergoes deuterium exchange in collisions with HD. CH+4 turns out to be a problem case, where pre...
متن کاملIon-molecule reactions of oxygenated chemical ionization reagents with vincamine.
The ion-molecule reactions of ions from acetone, dimethyl ether, 2-methoxyethanol, and vinyl methyl ether with vincamine were investigated. Reactions with dimethyl ether result in [M+13](+) and [M+45](+) products, reactions with 2-methoxyethanol produce [M+13](+) and [M+89](+) ions, and reactions with acetone or vinyl methyl ether ions generate predominantly [M+43](+) ions. Collision-activated ...
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ژورنال
عنوان ژورنال: Journal of the American Society for Mass Spectrometry
سال: 1991
ISSN: 1044-0305,1879-1123
DOI: 10.1016/1044-0305(91)80043-7