Electron Collision Frequency in Nitric Oxide

Abstract

The conductivity ratio, p , together with the electron radiation temperatures, T,, were measured in a n NO afterglow, using a microwave wave-guide diagnostic method and noise sampling technique respectively. T h e normalized values of p are plotted versus To in the electron radiation t e m p e r a t~~r e interval 1 200-12 000 I<' for pressures ranging from 0.25 to 4.0 Torr. A s s~~m i n g the electrons to be Maxwellia~lized, the total collisiol~ frequency can be expressed as v, = iV . 1.50 X 10-8z~(eV)~/2 within the limits of accuracy of the experiment; however, the relation v, = iV . 1.55 X 10-8z~(eV)o'4 yields a closer fit to the meall of the experimental data. The electron thermalization is found to be nearly independent of pressure, indicating that metastable i~lteractions may occur; some of these have been included in the discussion.

Electron recombination and diffusion in CO at elevated temperature

“…The value of a, for T = 273 OK has previously been measured (Mentzoni and Donohoe 1968a) to be 6.8 ) 1.2 x cm-3 s-' in the same pressure interval using the same diagnostic proCan. J. Phys.…”

“…Some details of the experimental arrangement used for the present study have been given previously (Mentzoni and Donohoe 1966). The main feature in this arrangement is that a d.c. discharge tube of fused quartz also functions as a cylindrical wave guide because of a gold coating on the outer surface of the tube.…”

“…T, = T,,,, the electron radiation temperature was measured as a function of post-discharge time. The microwave radiometer used for these measurements is described elsewhere (Mentzoni and Donohoe 1966). The electron thermalization was found to be quite rapid, occurring within the first 50 ps in Can.…”

“…In a previous study (Mentzoni and Donohoe 1968a) the room temperature value of the dissociative electron recombination coefficient, a,, for CO' was determined. For many years it has been realized on theoretical grounds that the dissociative electron recombination coefficient is dependent upon the electroil temperature, Tc (Bates and Dalgarno 1962), generally decreasing as the electron temperature increases.…”

High Power Cross-Modulation Plasma Diagnostics

“…On the basis of theory the conventional relaxation method fomula (8) requires that y = Ave/ve0 < 1. By plotting the modified time constant 7, in eq.…”