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Atoms 2017, 5(4), 50;

Nonlinear Spectroscopy of Alkali Atoms in Cold Medium of Astrophysical Relevance

Saint Petersburg State University, St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagielloński, 30-348 Kraków, Poland
Laser Centre, University of Latvia, LV-1002 Riga, Latvia
Astronomical Observatory, Volgina 7, 11060 Belgrad, Serbia
IHIS-Technoexperts, Bezanijska 23, 11080 Zemun, Serbia
Observatoire de Paris, 92195 Meudon CEDEX, France
Institute of Physics, University of Belgrad, P.O. Box 57, 11001 Belgrad, Serbia
Pulkovo Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
Dipartimento di Fisica Enrico Fermi and CNISM, Università di Pisa, I-56127 Pisa, Italy
Author to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 21 November 2017 / Accepted: 2 December 2017 / Published: 6 December 2017
(This article belongs to the Special Issue Spectral Line Shapes in Astrophysics and Related Topics)
Full-Text   |   PDF [877 KB, uploaded 6 December 2017]   |  


The time-dependent population dynamics of hyperfine (HF) sublevels of n 2 p 3 / 2 atomic states upon laser excitation in a cold medium of alkali atoms is examined. We demonstrate some peculiarities of the absorption HF multiplet formation in D2-line resulting from a long interaction time (∼200 μ s) interaction between light and Na ( n = 3 ) and Cs ( n = 6 ) atoms in a cold and slow sub-thermal ( T 1 K) beam. We analytically describe a number of D2-line-shape effects that are of interest in spectroscopic studies of cold dusty white dwarfs: broadening by optical pumping, intensity redistribution within components of D2-line HF multiplet for partially closed transitions and asymmetry of absorption lines induced by AC Stark shifts for cyclic transitions. View Full-Text
Keywords: spectroscopy; alkali atoms; astrophysics spectroscopy; alkali atoms; astrophysics

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Efimov, D.K.; Bruvelis, M.; Bezuglov, N.N.; Dimitrijević, M.S.; Klyucharev, A.N.; Srećković, V.A.; Gnedin, Y.N.; Fuso, F. Nonlinear Spectroscopy of Alkali Atoms in Cold Medium of Astrophysical Relevance. Atoms 2017, 5, 50.

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