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Astrophysical Lasers$
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Vladilen Letokhov and Sveneric Johansson

Print publication date: 2008

Print ISBN-13: 9780199548279

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780199548279.001.0001

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Astrophysical lasers on the Fe II lines

Astrophysical lasers on the Fe II lines

Chapter:
(p.144) 11 Astrophysical lasers on the Fe II lines
Source:
Astrophysical Lasers
Author(s):

Vladilen Letokhov

Sveneric Johansson

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199548279.003.0011

This chapter describes a Fe II astrophysical laser. Topics covered include radiative excitation and relaxation of Fe II levels, spectral peculiarities in Fe II, population inversion and amplification in Fe II transitions, radiative cycling with stimulated emission, effective temperature of Lyα from radiative cycle, sources of Lyα radiation pumping of Fe II in the Weigelt blobs, and Andromeda spectral puzzle.

Keywords:   Fe II astrophysical laser, radiative excitation, relaxation, radiative cycle

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