Abstract
Employing new atomic data and a 15 level collisional-radiative model, it is shown that population inversion, and consequent laser action, can be achieved in far-infrared (FIR) lines (C II) 157 micrometer, (N III) 58 micrometer, (O IV) 26 micrometer, (Ne VI) 7.6 micrometer, and (Mg VIII) 3 micrometer. Coupling of the lasting transition 2s<SUP>2</SUP>2p(<SUP>2</SUP>P<SUB>o</SUB><SUP>3/2</SUP>- <SUP>2</SUP>P<SUB>o</SUB><SUP>1/2</SUP>) to higher energy levels of the 2s2p<SUP>2</SUP> configuration in boron-like ions provides the dominant pumping flux. Lasing column lengths are found to be l approximately equal 10<SUP>-4</SUP>-1.0 pcs, at T<SUB>e</SUB> approximately equal 10<SUP>4</SUP>-10<SUP>6</SUP> K, N<SUB>e</SUB> approximately equal 10<SUP>4</SUP>-10<SUP>10</SUP>/cu cm, conditions and sizes prevalent in broad-line regions of active-galactic nuclei and novae. Detectable emission fluxes are estimated. Lasing activity in the source could significantly affect abundance determinations. The FIR line emission should be readily observable with the upcoming Infrared Space Observatory.
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