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Rayleigh Scattering in Spectral Series with L-term Interference

Casini, R., Manso Sainz, R., & Pino Alemán, T. d. (2017). Rayleigh Scattering in Spectral Series with L-term Interference. The Astrophysical Journal, 850(2): 162. doi:10.3847/1538-4357/aa9654.

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Genre: Journal Article

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Creators:
Casini, R., Author
Manso Sainz, R.1, Author
Pino Alemán, T. del, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289

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Abstract: We derive a formalism to describe the scattering of polarized radiation over the full spectral range encompassed by atomic transitions belonging to the same spectral series (e.g., the H i Lyman and Balmer series, the UV multiplets of Fe i and Fe ii). This allows us to study the role of radiation-induced coherence among the upper terms of the spectral series, and its contribution to Rayleigh scattering and the polarization of the solar continuum. We rely on previous theoretical results for the emissivity of a three-term atom of the Λ-type, taking into account partially coherent scattering, and generalize its expression in order to describe a "multiple Λ" atomic system underlying the formation of a spectral series. Our study shows that important polarization effects must be expected because of the combined action of partial frequency redistribution and radiation-induced coherence among the terms of the series. In particular, our model predicts the correct asymptotic limit of 100% polarization in the far wings of a complete (i.e., ${\rm{\Delta }}L=0,\pm 1$) group of transitions, which must be expected on the basis of the principle of spectroscopic stability.

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Language(s): eng - English
Dates: 2018-05-072017
Publication Status: Published online
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Rev. Type: Peer
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 850 (2) Sequence Number: 162 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3