An Experimental Determination of the Polarizability for Singly Ionized Argon
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1971
- Accession Number
- AD0736015
Entities
People
- M. P. Bristow
Organizations
- University of Toronto