Electron and thermal dissociation of BF3(g)

Electron and thermal dissociation of BF3(g)

Electron impact fragmentation studies were performed on the BF3(g) molecule. Appearance potentials for BF+2, BF+, and F+ ions produced in the fragmentation process were 16, 24, and 30 eV, respectively. The appearance potential of BF+2 was found to be only 0.2 eV greater than the I.P. of BF3(g). The...

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Veröffentlicht in:The Journal of chemical physics 1984-07, Vol.81 (1), p.241-244
Hauptverfasser: FARBER, M, SRIVASTAVA, R. D
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Atomic and molecular collision processes and interactions
Atomic and molecular physics
Electron scattering
Exact sciences and technology
Physics
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description Electron impact fragmentation studies were performed on the BF3(g) molecule. Appearance potentials for BF+2, BF+, and F+ ions produced in the fragmentation process were 16, 24, and 30 eV, respectively. The appearance potential of BF+2 was found to be only 0.2 eV greater than the I.P. of BF3(g). The fragmentation ratio of the ionic concentrations at 70 eV for BF+3, BF+2, BF+, and F+ is 10/100/8/3. The primary mechanism for the thermal dissociation of BF3(g) is to the lower borofluorides in nearly equal concentrations. Dissociation to the dimeric borofluorides and F atoms is negligible, with F atom concentrations less than 1% of the three borofluorides. Ionization potentials for BF3(g), BF2(g), and BF(g) were 16, 9, and 11 eV (all ±1), respectively. The partial pressures for the isomolecular reaction BF3(g)+BF(g)=2BF2(g) in the temperature range 1780 to 1900 K yielded a ΔH298 of 17.1±0.5 kcal/mol, resulting in a ΔHf298 of BF2(g) of −141.0±0.5 kcal/mol, in good agreement with the photoionization and electron impact values.
doi_str_mv 10.1063/1.447368
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The partial pressures for the isomolecular reaction BF3(g)+BF(g)=2BF2(g) in the temperature range 1780 to 1900 K yielded a ΔH298 of 17.1±0.5 kcal/mol, resulting in a ΔHf298 of BF2(g) of −141.0±0.5 kcal/mol, in good agreement with the photoionization and electron impact values.</abstract><cop>Woodbury, NY</cop><pub>American Institute of Physics</pub><doi>10.1063/1.447368</doi><tpages>4</tpages></addata></record>
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Atomic and molecular physics
Electron scattering
Exact sciences and technology
Physics
title Electron and thermal dissociation of BF3(g)
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