Accession Number : AD0711828

Title :   BASIC PLASMA PROCESSES.

Descriptive Note : Final rept. 1 Jul 69-30 Sep 70,

Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA APPLIED PHYSICS AND MATHEMATICS RESEARCH

Personal Author(s) : Phelps,A. V. ; Chen,C. L.

Report Date : 30 SEP 1970

Pagination or Media Count : 58

Abstract : A theory was developed describing the magnitude and wavelength dependence of the resonance radiation emitted as the result of thermal excitation. The predictions of the theory are compared with the results of measurements at a temperature of 788K as obtained in a cell capable of operating up to 1050K. The absorption coefficients and total absorption for the cesium resonance lines at 8944, 8521, 4593 and 4555 A for cesium is argon at pressures near atmospheric have been measured over a wide range of cesium densities and found to scale as the product of the cesium and argon densities. These results are consistent with broadening as the result of binary collisions between cesium and argon atoms. Our theory of resonance fluorescence for optically thick systems is found to give good agreement with experiments in which mercury was illuminated with a resonance line source. The dominant loss mechanism at moderate and high densities is diffusion to the window. Significant discrepancies remain between the theory and our measurements in cesium using a white light source. (Author)

Descriptors :   (*CESIUM, PLASMAS(PHYSICS)), (*CYCLOTRON RESONANCE PHENOMENA, THEORY), EXCITATION, ABSORPTION, VAPOR PRESSURE, DIFFUSION, QUENCHING(INHIBITION), LINE SPECTRA, REFLECTION, BACKSCATTERING, FLUORESCENCE

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE