COLLISION FREQUENCY MEASUREMENTS IN OXYGEN AND HELIUM MAGNETOPLASMA AFTERGLOWS.
Abstract
Collision frequency measurements were carried out in helium and oxygen at thermal energies. The helium measurements yield a collision probability of 18.7 at 300K and 1 torr pressure. This corresponds to a cross section for momentum transfer of 5.29 x 10 to the -16th power sq-cm. at 300K. The helium collision frequency f is directly proportional to approximately the first power of the velocity at 300K. The oxygen measurements yield a value of f = 4.6 x 10 to the -8th power N(O2)u where u is the electron energy in electron volts and N(O2) is the number density of oxygen molecules. The measurements were carried out by two independent methods. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1965
- Accession Number
- AD0620664
Entities
People
- G. E. Veatch
- J. H. Cahn
- J. T. Verdeyen
Organizations
- University of Illinois Urbana–Champaign