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Title: Rotational dependence of the proton-transfer reaction HBr{sup +}+ CO{sub 2}{yields} HOCO{sup +}+ Br. II. Comparison of HBr{sup +} ({sup 2}{Pi}{sub 3/2}) and HBr{sup +} ({sup 2}{Pi}{sub 1/2})

Abstract

The effects of reactant ion rotational excitation on the exothermic proton-transfer reactions of HBr{sup +}({sup 2}{Pi}{sub 1/2}) and DBr{sup +}({sup 2}{Pi}{sub 1/2}), respectively, with CO{sub 2} were studied in a guided ion beam apparatus. Cross sections are presented for collision energies in the center of mass system E{sub c.m.} in the range of 0.23 to 1.90 eV. The HBr{sup +}/DBr{sup +} ions were prepared in a state-selective manner by resonance enhanced multiphoton ionization. The mean rotational energy was varied from 3.4 to 46.8 meV for HBr{sup +}({sup 2}{Pi}{sub 1/2}) and from 1.8 to 40.9 meV for DBr{sup +}({sup 2}{Pi}{sub 1/2}). Both reactions studied are inhibited by collision energy, as expected for exothermic reactions. For all collision energies considered, the cross section decreases with increasing rotational energy of the ion, but the degree of the rotational dependence differs depending on the collision energy. For E{sub c.m.}= 0.31 eV, the cross sections of the deuteron transfer are significantly larger than those of the proton transfer. For higher E{sub c.m.} they differ very little. The current results for the exothermic proton transfer are systematically compared to previously published data for the endothermic proton transfer starting from HBr{sup +}({sup 2}{Pi}{sub 3/2}) [L. Paetow etmore » al., J. Chem. Phys. 132, 174305 (2010)]. Additional new data regarding the latter reaction are presented to further confirm the conclusions. The dependences on rotational excitation found cannot be explained by the corresponding change in the total energy of the system. For both the endothermic and the exothermic reaction, the cross section is maximized for the smallest rotational energy, at least well above the threshold.« less

Authors:
; ; ;  [1]
  1. Philipps-Universitaet Marburg, Fachbereich Chemie, Hans-Meerwein-Strasse, 35032 Marburg (Germany)
Publication Date:
OSTI Identifier:
21559962
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 133; Journal Issue: 23; Other Information: DOI: 10.1063/1.3515300; (c) 2010 American Institute of Physics; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CARBON DIOXIDE; CATIONS; CENTER-OF-MASS SYSTEM; COMPARATIVE EVALUATIONS; CROSS SECTIONS; DEUTERONS; EXCITATION; HYDROGEN COMPOUNDS; ION BEAMS; ION-MOLECULE COLLISIONS; MOLECULE-MOLECULE COLLISIONS; MOLECULES; MULTI-PHOTON PROCESSES; PHOTOIONIZATION; PHOTON-MOLECULE COLLISIONS; PROTONS; RESONANCE; ROTATIONAL STATES; TRANSFER REACTIONS; BARYONS; BEAMS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHARGED PARTICLES; COLLISIONS; DIRECT REACTIONS; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; EVALUATION; EXCITED STATES; FERMIONS; HADRONS; ION COLLISIONS; IONIZATION; IONS; MOLECULE COLLISIONS; NUCLEAR REACTIONS; NUCLEONS; OXIDES; OXYGEN COMPOUNDS; PHOTON COLLISIONS

Citation Formats

Paetow, Lisa, Unger, Franziska, Beutel, Bernd, and Weitzel, Karl-Michael. Rotational dependence of the proton-transfer reaction HBr{sup +}+ CO{sub 2}{yields} HOCO{sup +}+ Br. II. Comparison of HBr{sup +} ({sup 2}{Pi}{sub 3/2}) and HBr{sup +} ({sup 2}{Pi}{sub 1/2}). United States: N. p., 2010. Web. doi:10.1063/1.3515300.
Paetow, Lisa, Unger, Franziska, Beutel, Bernd, & Weitzel, Karl-Michael. Rotational dependence of the proton-transfer reaction HBr{sup +}+ CO{sub 2}{yields} HOCO{sup +}+ Br. II. Comparison of HBr{sup +} ({sup 2}{Pi}{sub 3/2}) and HBr{sup +} ({sup 2}{Pi}{sub 1/2}). United States. https://doi.org/10.1063/1.3515300
Paetow, Lisa, Unger, Franziska, Beutel, Bernd, and Weitzel, Karl-Michael. 2010. "Rotational dependence of the proton-transfer reaction HBr{sup +}+ CO{sub 2}{yields} HOCO{sup +}+ Br. II. Comparison of HBr{sup +} ({sup 2}{Pi}{sub 3/2}) and HBr{sup +} ({sup 2}{Pi}{sub 1/2})". United States. https://doi.org/10.1063/1.3515300.
@article{osti_21559962,
title = {Rotational dependence of the proton-transfer reaction HBr{sup +}+ CO{sub 2}{yields} HOCO{sup +}+ Br. II. Comparison of HBr{sup +} ({sup 2}{Pi}{sub 3/2}) and HBr{sup +} ({sup 2}{Pi}{sub 1/2})},
author = {Paetow, Lisa and Unger, Franziska and Beutel, Bernd and Weitzel, Karl-Michael},
abstractNote = {The effects of reactant ion rotational excitation on the exothermic proton-transfer reactions of HBr{sup +}({sup 2}{Pi}{sub 1/2}) and DBr{sup +}({sup 2}{Pi}{sub 1/2}), respectively, with CO{sub 2} were studied in a guided ion beam apparatus. Cross sections are presented for collision energies in the center of mass system E{sub c.m.} in the range of 0.23 to 1.90 eV. The HBr{sup +}/DBr{sup +} ions were prepared in a state-selective manner by resonance enhanced multiphoton ionization. The mean rotational energy was varied from 3.4 to 46.8 meV for HBr{sup +}({sup 2}{Pi}{sub 1/2}) and from 1.8 to 40.9 meV for DBr{sup +}({sup 2}{Pi}{sub 1/2}). Both reactions studied are inhibited by collision energy, as expected for exothermic reactions. For all collision energies considered, the cross section decreases with increasing rotational energy of the ion, but the degree of the rotational dependence differs depending on the collision energy. For E{sub c.m.}= 0.31 eV, the cross sections of the deuteron transfer are significantly larger than those of the proton transfer. For higher E{sub c.m.} they differ very little. The current results for the exothermic proton transfer are systematically compared to previously published data for the endothermic proton transfer starting from HBr{sup +}({sup 2}{Pi}{sub 3/2}) [L. Paetow et al., J. Chem. Phys. 132, 174305 (2010)]. Additional new data regarding the latter reaction are presented to further confirm the conclusions. The dependences on rotational excitation found cannot be explained by the corresponding change in the total energy of the system. For both the endothermic and the exothermic reaction, the cross section is maximized for the smallest rotational energy, at least well above the threshold.},
doi = {10.1063/1.3515300},
url = {https://www.osti.gov/biblio/21559962}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 23,
volume = 133,
place = {United States},
year = {Tue Dec 21 00:00:00 EST 2010},
month = {Tue Dec 21 00:00:00 EST 2010}
}