EXPERIMENTAL INVESTIGATION OF THE SCATTERING OF A NITROGEN AERODYNAMIC MOLECULAR BEAM FROM A SOLID NITROGEN SURFACE
Final technical rept. Dec 1969-Jan 1970
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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An aerodynamic molecular beam and phase sensitive detection system were used to investigate the spatial distributions of nitrogen molecules scattered from solid nitrogen for 1 incident beam energies of 0.44 ev source stagnation temperature To 1440K to 0.88 ev To 2760K, 2 incident angles with respect to surface normal of 30 to 70 deg, and 3 a surface temperature of 23K. Highly lobular reflected distributions centered 15 deg from the surface opposite the incident beam were observed with position and shape independent of incident energy and angle. The capture coefficient decreased sharply with increasing beam energy and incident angle from normal. A limited investigation of a nitrogen-argon mixture was also undertaken. The reflected spatial distributions for the components were similar to those observed for the individual pure gases. A seeding effect in the expansion was observed to accelerate the heavier gas. Transient effects were also investigated.
- Atomic and Molecular Physics and Spectroscopy