Electron-impact dissociation of H3O+
- 1. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332
Description
Fragment cross sections for electron impact dissociation of H3O+ into OH+ and O+, and for dissociation of D3O+ into D2O+ have been measured in a crossed beam appartus for electron energies from threshold to 1000 eV. The cross sections for O+ and OH+ rise abruptly at threshold indicating that the mechanism for dissociation is via production of an electronically excited state of H3O+ and direct dissociation into O+ and OH+. At high energy the cross section has a falloff σproportionalln(E)/E expected in the Bethe-Born approximation. At 200 eV electron energy the cross sections for fragments are: D2O+, σ = 6.7 +- 1.8 x 10-17 cm2; OH+, σ = 3.0 +- 0.6 x 10-17 cm2; O+, σ = 7.9 +- 1.6 x 10-18 cm2. The observed threshold energies for OH+ and O+ production are 14 +- 3 and 19 +- 3 eV, respectively
Additional details
Publishing Information
- Journal Title
- J. Chem. Phys.
- Journal Volume
- 85
- Journal Issue
- 6
- Series
- J. Chem. Phys.
- Journal Page Range
- 3386-3394
- ISSN
- 0021-9606
- CODEN
- JCPSA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 18015592
- Subject category
- S74: ATOMIC AND MOLECULAR PHYSICS;
- Descriptors DEI
- CROSS SECTIONS; DISSOCIATION; ELECTRON BEAMS; ELECTRON-ION COLLISIONS; EV RANGE 01-10; EV RANGE 10-100; EV RANGE 100-1000; ION BEAMS; OXONIUM IONS
- Descriptors DEC
- BEAMS; CHARGED PARTICLES; COLLISIONS; ELECTRON COLLISIONS; ENERGY RANGE; EV RANGE; ION COLLISIONS; IONS; LEPTON BEAMS; MOLECULAR IONS; PARTICLE BEAMS