Bound-Bound Radiation/Collisional-Radiative Recombination in Oxygen and Nitrogen Plasmas
Final rept. 1 Jan-31 Dec 1974
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
Number densities of several excited states of atomic oxygen and nitrogen have been measured in the decaying non-thermal plasma of a theta-pinch afterglow. The spatial variation of the electron density and temperature as a function of time after the initiation of main bank discharge have also been measured to facilitate a comparison of excited state number densities with model calculations. Measurements of the atomic oxygen excited states indicate that quintet to triplet spin exchange collisions and doubly excited states must be included in the model. The measured populations of the excited atomic nitrogen states agree well with those calculated at high density but disagree badly at lower densities. The discrepancies seem to be real since they are larger than expected measurement uncertainty.
- Plasma Physics and Magnetohydrodynamics