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Paschen-Back effect involving atomic fine and hyperfine structure states

Published online by Cambridge University Press:  24 July 2015

K. Sowmya ,
K. N. Nagendra ,
M. Sampoorna  and
J. O. Stenflo
K. Sowmya
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bengaluru, India email: [email protected]; [email protected]; [email protected]
K. N. Nagendra
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bengaluru, India email: [email protected]; [email protected]; [email protected]
M. Sampoorna
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bengaluru, India email: [email protected]; [email protected]; [email protected]
J. O. Stenflo
Affiliation:
Institute of Astronomy, ETH Zurich, CH-8093 Zurich, Switzerland Istituto Ricerche Solari Locarno, Via Patocchi, 6605 Locarno-Monti, Switzerland email: [email protected]
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Abstract

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The linear polarization in spectral lines produced by coherent scattering is significantly modified by the quantum interference between the atomic states in the presence of a magnetic field. When magnetic fields produce a splitting which is of the order of or greater than the fine or hyperfine structure splittings, we enter the Paschen-Back effect (PBE) regime, in which the magnetic field dependence of the Zeeman splittings and transition amplitudes becomes non-linear. In general, PBE occurs for sufficiently strong fields when the fine structure states are involved and for weak fields in the case of hyperfine structure states. In this work, we apply the recently developed theory of PBE in the atomic fine and hyperfine structure states including the effects of partial frequency redistribution to the case of Li i 6708 Å doublet. We explore the signatures of PBE in a single scattering event and their applicability to the solar magnetic field diagnostics.

Keywords

atomic processespolarizationscatteringSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S305: Polarimetry: From the Sun to Stars and Stellar Environments , December 2014 , pp. 154 - 158
Copyright
Copyright © International Astronomical Union 2015 

References

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Sowmya, K., Nagendra, K. N., Sampoorna, M., & Stenflo, J. O. 2014b, ApJ 793, 71 Google Scholar
Stenflo, J. O. 2011, in: Kuhn, J. R., Harrington, D. M., Lin, H., Berdyugina, S. V., Trujillo Bueno, J., Keil, S. L., & Rimmele, T. (eds.), Solar Polarization 6, ASP Conf. Series 437 (San Francisco: ASP), p. 3 Google Scholar