LABORATORY VERIFICATION STUDIES OF ROTATIONAL AND VIBRATIONAL TEMPERATURE MEASUREMENTS BY THE ELECTRON BEAM TECHNIQUE
Final rept. 1 Jan-Sep 1968
ARO INC ARNOLD AFS TN
Pagination or Media Count:
To verify the physical parameters and limits of the electron beam technique, precise laboratory experiments were conducted. By injecting an electron beam into an experimental chamber containing slowly flowing nitrogen and spectroscopically examining the resulting spontaneous light emission the analysis of this technique is accomplished. Measurements of the rotational and vibrational temperatures of nitrogen have been made over the temperature range 78 - 300K and at pressures of 0.001-1.00 Torr using a 10 KV electron beam with currents of 0.06-4.5 milliamperes. The measurements were made photoelectrically, and signal amplification and averaging were accomplished with a lock-in amplifier. The results of the rotational temperature measurements display a dependence of rotational temperatures on gas density and beam current. Rotational temperature was also found to vary with the number of spectral lines used and with the vibrational band as well. Vibrational band intensities of the N21- system were measured by electronic integration of the rotational structure, and a pressure dependence of various band intensity ratios was observed.
- Fluid Mechanics
- Atomic and Molecular Physics and Spectroscopy