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Nonlinear spectroscopy in astronomy: assignement of diffuse interstellar absorption bands to L(α) -induced, two-photon absorption by H2 molecules

✍ Scribed by Peter P. Sorokin; James H. Glownia

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 437 KB
Volume: 234
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)00099-p

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✦ Synopsis

All (twelve) optical diffuse interstellar absorption bands appearing in the interval 768.0-788.0 nm are assigned on the basis of a nonlinear effect: Lyman-alpha-driven, resonantly enhanced two-photon absorption by hydrogen molecules located near H II regions of young, hot stars.

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✍ Theodore P. Snow 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 285 KB

It has been proposed that some of the diffuse interstellar absorption bands which have puzzled astronomers for several decades may be assigned to transitions in vibrationally excited H 2 molecules. These molecules would arise in circumstellar environments where stellar Lyman-cx photons create a popu