Burbidge, E. M., Tucson Conference on Seyfert Galaxies and Related Objects, Astronomical Journal (in the press). Braccesi, A., Lynds, C. R., and Sandage, A., Ap. J ...
Conversely, if energy is injected into the system, the occupation probability of the upper level increases. If it surpasses the occupation probability of the lower level, population inversion occurs ...
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