Radiation of Tenuous Air with Contaminants at Low Temperatures
In this chapter we deal with non-equilibrium radiation of air at low temperatures, i.e., primarily below 6000°K, and at low densities. We are considering systems smaller in dimension than the radiative mean free path and under such conditions a Boltzmann distribution among the excited electronic state populations at a definable temperature can only be maintained if collision excitation and de-excitation mechanisms are dominant and are in balance. If the density of the air is low enough, radiative processes will compete with the collision processes, and the excited state populations can deviate significantly from those predicted by LTE. This in turn will drastically affect the radiative properties of the air.
KeywordsVibrational State Vibrational Level Positive System Excitation Rate Electron Recombination
Unable to display preview. Download preview PDF.
- Allen, C.W., Astrophysical Quantities, The Athlone Press, London (1963).Google Scholar
- Brehm, B., W. Demtröder, O. Osberghaus, and H. Ehrhardt, Second Conference on the Physics of Electronic and Atomic Collisions, Univ. of Colorado (1961).Google Scholar
- Gilmore, F.R., Approximate Radiation Properties of Air Between 2000 and 8000°K, RM-3997-ARPA, The RAND Corp., Santa Monica, Calif. (1964).Google Scholar
- McDaniel, E.W., Collision Phenomena in Ionized Gases, John Wiley and Sons, New York (1964).Google Scholar
- Penner, S.S., Quantitative Molecular Spectroscopy and Gas Emissivities, Addison-Wesley, Reading, Mass. (1959).Google Scholar
- Seaton, M.J., Atomic and Molecular Processes, ed. by D.R. Bates, Academic Press, New York (1962).Google Scholar
- Sheridan, W.F., O. Oldenberg, and N.P. Carleton, Atomic Collision Processes, Proceedings of the 3rd Conference on Electronic and Atomic Collisions, ed. by M.R.C. McDowell, North-Holland Publishing Co., Amsterdam (1964).Google Scholar
- Utterback, N.G. and G.H. Miller, Proceedings of the Atomic and Molecular Beams Conference, Univ. of Denver (1960).Google Scholar