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A Masing [Fe Xi] Line, Gary J. Ferland
A Masing [Fe Xi] Line, Gary J. Ferland
Physics and Astronomy Faculty Publications
I draw attention to a maser which occurs within the ground term of Fe10+. In many photoionized environments, infrared fine-structure lines and the [O I] λ6300 line become optically thick but maser amplification of ionic fine-structure lines is unusual. During the course of development of a code designed to simulate gas under radiative-collisional equilibrium, the radiative transfer of roughly 500 ionic/atomic emission lines was treated using escape probabilities. Nearly all forbidden lines can become optically thick under extreme conditions, but the 3Pj = 1, 0 [Fe XI] 6.08 μm transition is the only line …