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Stefan Athenstädt, Franziska Unger, Karl-Michael Weitzel
Rotational Dependence of the Proton Transfer Reaction HBr + (N + ) + CO2 → HOCO + + Br
Keywords: ion molecule reactions, rotational state selection, Reaction Kinetics, cross sections
Absolute cross sections and rate constants for the endothermic proton transfer reaction of rotationally state selected HBr + ions with CO2 were measured as a function of the rotational energy for different center-of-mass (c.m.) collision energies. State selection of HBr + ions was achieved via a (2+1) resonance enhanced multiphoton ionization (REMPI) process. By choosing different pump lines the mean rotational energy of HBr + was varied from 1.6 to 25.9 meV. All experiments were performed in a linear ion guide apparatus. Collision energies considered ranged from 0.28 to 0.85 eV (c.m.). At the highest collision energies the cross section decreases by about 60% from 10 Å2 to 4 Å2 with increasing rotational energy. In contrast to that, at the lowest collision energies the cross section was about 2.5 Å2, independent of the rotational energy.
Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0942-9352
Volume: 221, 05/2007
Pages: 571 - 584