Electron-impact dissociation of H/sub 3/O/sup +/

Journal Article · Mon Sep 15 04:00:00 EDT 1986 · J. Chem. Phys.; (United States)

OSTI ID:5110007

Schulz, P A; Gregory, D C; Meyer, F W; Phaneuf, R A

Fragment cross sections for electron impact dissociation of H/sub 3/O/sup +/ into OH/sup +/ and O/sup +/, and for dissociation of D/sub 3/O/sup +/ into D/sub 2/O/sup +/ have been measured in a crossed beam appartus for electron energies from threshold to 1000 eV. The cross sections for O/sup +/ and OH/sup +/ rise abruptly at threshold indicating that the mechanism for dissociation is via production of an electronically excited state of H/sub 3/O/sup +/ and direct dissociation into O/sup +/ and OH/sup +/. At high energy the cross section has a falloff sigmaproportionalln(E-italic)/E-italic expected in the Bethe-Born approximation. At 200 eV electron energy the cross sections for fragments are: D/sub 2/O/sup +/, sigma = 6.7 +- 1.8 x 10/sup -17/ cm/sup 2/; OH/sup +/, sigma = 3.0 +- 0.6 x 10/sup -17/ cm/sup 2/; O/sup +/, sigma = 7.9 +- 1.6 x 10/sup -18/ cm/sup 2/. The observed threshold energies for OH/sup +/ and O/sup +/ production are 14 +- 3 and 19 +- 3 eV, respectively.

• Research Organization: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332
• OSTI ID: 5110007
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 85:6; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISSOCIATION
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EV RANGE 100-1000
ION BEAMS
ION COLLISIONS
IONS
LEPTON BEAMS
MOLECULAR IONS
OXONIUM IONS
PARTICLE BEAMS