Rotational excitation and momentum transfer cross sections for electrons in H/sup 2/ and N/sup 2/ from transport coefficients
The theoretical values of the transport coefficients were obtained by calculating accurate electron energy distribution functions with an assumed set of elastic and inelastic cross sections. The discrete nature of the energy loss occurring in a rotational or vibrational excitation collision was included in the theory, as were collisions of the second kind with thermally excited molecules. The resulting values of drift velocity and characteristic energy, D/mu, were compared with experimental data, and adtustments were made in the assumed cross sections until good agreement was obtained. The final values of the rotational excitation cross sections are 2.5 times the values computed using the latest available values for the molecular electric quadrupole moments. In hydrogen, the analysis has been extended to energies for which vibrational excitation is important. A vibrational cross section with a maximum of roughly 5 x 10/sup -17/ cm/sup 2/ at 3 eV is consistent with the measurements.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA)
- OSTI ID:
- 6580713
- Report Number(s):
- AD-274635
- Country of Publication:
- United States
- Language:
- English
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Molecular & Chemical Physics-- Collision Phenomena
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED-PARTICLE TRANSPORT
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DIFFUSION
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FERMIONS
FLUIDS
HYDROGEN
INELASTIC SCATTERING
LEPTONS
LOSSES
MOLECULE COLLISIONS
NITROGEN
NONMETALS
RADIATION TRANSPORT
ROTATIONAL STATES
SCATTERING
VELOCITY
VIBRATIONAL STATES