PRELIMINARY INVESTIGATION OF THE INTERACTION OF 0.30- TO 0.54-EV GASEOUS ARGON WITH A SOLID ARGON SURFACE
Abstract
An aerodynamic molecular beam and phase-sensitive detection system were used to investigate the spatial distributions of argon atoms reflected from solid argon for incident energies of from 0.30 (beam temperature of 1400K) to 0. 54 ev (beam temperature of 2500K), incident angles from 0 to 70 deg, and solid argon temperatures of 15K. Both in-plane and out-of-plane spatial distribution measurements were made, and highly nondiffuse supraspecular spatial flux distributions were observed for the noncondensing atoms. The angle of maximum reflected intensity was independent of both beam incident angle and beam energy. For incident angles (measured with respect to the surface normal) of 5 deg or less, 'backward' reflection lobes were observed, and the magnitude of the reflected flux increased as the angle of incidence approached zero. The beam capture coefficient was a function of the incident beam energy and the angle of incidence. However, with a beam source temperature of 2500K, the capture coefficient was near unity for normal incidence.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1969
- Accession Number
- AD0696106
Entities
People
- M. R. Busby
- R. F. Brown
Organizations
- Arnold Engineering Development Complex