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Radiative Cycle with Stimulated Emission from Atoms and Ions in an Astrophysical Plasma

Johansson, Sveneric LU and Letokhov, Vladilen LU (2003) In Physical Review Letters 90(1:11101).
Abstract
We propose that a radiative cycle operates in atoms and ions located ina rarefied gas in the vicinity of a hot star. Besides spontaneoustransitions the cycle includes a stimulated transition in one very weakintermediate channel. This radiative bottleneck creates apopulation inversion, which for an appropriate column density results inamplification and stimulated radiation in the weak transition. Thestimulated emission opens a fast decay channel leading to a fastradiative cycle in the atom (or ion). We apply this model by explainingtwo unusually bright FeII lines at 250.7 and 250.9nm in the UV spectrumof gas blobs close to eta Carinae, one of the most massive andluminous stars in the Galaxy.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
90
issue
1:11101
publisher
American Physical Society
external identifiers
  • wos:000180318300006
  • scopus:0037428609
ISSN
1079-7114
DOI
10.1103/PhysRevLett.90.011101
language
English
LU publication?
yes
id
6dc03de6-4471-46a0-baa9-27a781e5c674 (old id 130599)
date added to LUP
2007-07-13 12:17:43
date last changed
2018-10-03 09:14:50
@article{6dc03de6-4471-46a0-baa9-27a781e5c674,
  abstract     = {We propose that a radiative cycle operates in atoms and ions located ina rarefied gas in the vicinity of a hot star. Besides spontaneoustransitions the cycle includes a stimulated transition in one very weakintermediate channel. This radiative bottleneck creates apopulation inversion, which for an appropriate column density results inamplification and stimulated radiation in the weak transition. Thestimulated emission opens a fast decay channel leading to a fastradiative cycle in the atom (or ion). We apply this model by explainingtwo unusually bright FeII lines at 250.7 and 250.9nm in the UV spectrumof gas blobs close to eta Carinae, one of the most massive andluminous stars in the Galaxy.},
  author       = {Johansson, Sveneric and Letokhov, Vladilen},
  issn         = {1079-7114},
  language     = {eng},
  number       = {1:11101},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Radiative Cycle with Stimulated Emission from Atoms and Ions in an Astrophysical Plasma},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.90.011101},
  volume       = {90},
  year         = {2003},
}