Vibrational-excitation cross sections of water molecules by electron impact

Journal Article · Fri Jul 15 04:00:00 EDT 1988 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.38.678· OSTI ID:7058833

Shyn, T W; Cho, S Y; Cravens, T E

Absolute differential cross sections for vibrational excitation of water-vapor molecules are measured by use of a crossed-beam method. The energy and angular range were from 2.2 to 20 eV and from 30/sup 0/ to 150/sup 0/, respectively. Vibrational-excitation cross sections were measured for the bending (010) and stretching (100) and (001) modes of the electronic ground state. A broad resonance for the stretching modes near 6-eV impact energy was observed. The present results generally agree in angular distribution with the measurements by G. Seng and F. Linder (J. Phys. B. 9, 2539 (1976)), except below 30/sup 0/ scattering angle. However, the integral cross sections agree within experimental uncertainty. The theoretical results of A. Jain and D. G. Thompson (J. Phys. B 16, L347 (1983)) for the bending mode are in good agreement with the present results. These new results have implications for theoretical modeling of cometary ionospheres.

• Research Organization: Space Physics Research Laboratory, University of Michigan, Ann Arbor, Michigan 48109-2143
• OSTI ID: 7058833
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 38:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BEAMS
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRON-MOLECULE COLLISIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
ENERGY-LOSS SPECTROSCOPY
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
MOLECULE COLLISIONS
NUMERICAL DATA
OXYGEN COMPOUNDS
ROTATIONAL STATES
SPECTROSCOPY
VIBRATIONAL STATES
WATER