Inversion and gain in hydrogenic ion levels induced by photoionization pumping
If a low-Z plasma is subjected to ionizing radiation, stationary inversions on hydrogenic ion level populations occur. The plasma conditions and pumping requirements to achieve gain on the Lyman-alpha and Balmer-alpha lines are investigated by means of a collisional-radiative model. The calculations are carried out for two cases: first, for the case in which the electron temperature is determined solely by radiative cooling; second, for the case in which additional electron cooling is provided. In the first case, measurement gain on the Balmer-alpha line is found, although the Lyman-alpha transition remains uninverted. In the second case, the Balmer-alpha gain is dramatically enhanced, and sizable Lyman-alpha gain is predicted.
Bibliographic Reference: Article: Journal of Applied Physics, Vol. 64 (1988), No. 3, pp. 1005-1014
Record Number: 198910481 / Last updated on: 1994-12-01
Original language: en
Available languages: en