Accession Number:

AD0736015

Title:

An Experimental Determination of the Polarizability for Singly Ionized Argon

Descriptive Note:

Corporate Author:

TORONTO UNIV DOWNSVIEW (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s):

Report Date:

1971-04-01

Pagination or Media Count:

93.0

Abstract:

Two-wavelength interferometry, employing either a ruby 6943A or a neodymium 10,600A laser with a second harmonic generator, was used to study argon plasmas in a shock tube for shock Mach numbers from 17 to 24, initial pressures from 3.0 to 0.3 mm Hg and for degrees of ionization up to 50. The measured equilibrium electron densities for both wavelength pairs were about 1. 9 greater than the calculated values accounting for the excited states, but 1. 6 less than the values based on the neglect of these states. Assuming a plasma of free electrons and ground-state atoms and ions, the interferograms yielded ratios of the polarizability for the argon ion to that for the atom. These results are in general agreement with the value of 0.716 for the ratio of the static polarizabilities obtained by the method of Slater screening constants.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE