Predicted electron transport coefficients at high E/N values. II. Nitrogen
Transport coefficients of electrons in nitrogen are calculated over the range 10/sup -16/< or =E/N< or =7.3 x 10/sup -15/ V cm/sup 2/ by solving the Boltzmann equation using the classical two-term expansion in spherical harmonics. However, as in the case of H/sub 2/ treated in a previous paper, the sources of new electrons produced by ionization has been accounted for in the Boltzmann equation. It is shown that the release of these new electrons has an effect on the distribution function starting from E/Napprox. =2 x 10/sup -15/ V cm/sup 2/, which increases rapidly as E/N increases. The recently available cross sections for the excitation of the electronic states of N/sub 2/ have been used along with the total-momentum-transfer cross section derived by Cartwright. The predicted values of the ionization coefficient are in very good agreement with the experimentally measured values except at low E/N values, for which our predicted ionization coefficients are slightly less than the experimental ones. The agreement is also good for the drift velocities over the entire E/N range, while for the characteristic energies the agreement becomes less satisfactory for E/N>2.5 x 10/sup -15/ V cm/sup 2/. The electron excitation rates for the first eight vibrational levels, the A /sup 3/..sigma../sup +//sub u/, B /sup 3/Pi/sub g/, W /sup 3/..delta../sub u/, and C /sup 3/Pi/sub u/ electronic states are presented as a function of E/N. The ionization rate and the total dissociation rate (including the dissociative ionization process) are also given as a function of E/N. The percentage of the input power which is delivered to the elastic and the various inelastic processes are presented as a function of E/N.
- Research Organization:
- Laboratoires de Marcoussis, Centre de Recherches de la C.G.E., Division Lasers, 91460 Marcoussis, France
- OSTI ID:
- 6211017
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:7; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOLTZMANN EQUATION
CHARGED-PARTICLE TRANSPORT
CROSS SECTIONS
CRYOGENIC FLUIDS
DATA
DIFFERENTIAL EQUATIONS
DISTRIBUTION FUNCTIONS
ELEMENTS
EQUATIONS
FLUIDS
FORECASTING
HYDROGEN
INFORMATION
IONIZATION
NITROGEN
NONMETALS
RADIATION TRANSPORT
SPHERICAL HARMONICS METHOD