Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phst..120...99j&link_type=abstract
Physica Scripta, Volume T120, pp. 99-104 (2005).
Astronomy and Astrophysics
Astrophysics
Scientific paper
We consider the conditions necessary for the development of an inverted population among the energy levels of free atoms in a medium exposed to radiation in spectral non-equilibrium. In particular, we focus on monochromatic radiation occurring as a result of an accidental wavelength coincidence between a pumping emission line and a pumped absorption line in two different elements. We examine especially the influence of `pseudo-metastable' states (at medium excitation) in the complex spectrum of Fe II, which cause a `bottleneck' in the radiative decay leading to an inverted level population. We also discuss the effect of `spectral compression' of the Lyman continuum into HLyα radiation at a high effective temperature. In conclusion we describe those differences between microwave astrophysical masers (APM) and optical astrophysical lasers (APL) that make the latter a more rare phenomenon in Nature.
Johansson Sara
Letokhov Vladilen
No associations
LandOfFree
Stimulated Amplification under Spatially Nonhomogeneous Conditions: An Astrophysical Fe II Laser in the Vicinity of Eta Carinae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stimulated Amplification under Spatially Nonhomogeneous Conditions: An Astrophysical Fe II Laser in the Vicinity of Eta Carinae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stimulated Amplification under Spatially Nonhomogeneous Conditions: An Astrophysical Fe II Laser in the Vicinity of Eta Carinae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1065879