Accession Number:

AD0620664

Title:

COLLISION FREQUENCY MEASUREMENTS IN OXYGEN AND HELIUM MAGNETOPLASMA AFTERGLOWS.

Descriptive Note:

Scientific rept.,

Corporate Author:

ILLINOIS UNIV URBANA GASEOUS ELECTRONICS LAB

Personal Author(s):

Report Date:

1965-07-01

Pagination or Media Count:

44.0

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 NO2u where u is the electron energy in electron volts and NO2 is the number density of oxygen molecules. The measurements were carried out by two independent methods. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE