{"ID":5471066,"CreatedAt":"2026-07-01T07:52:17.663972604Z","UpdatedAt":"2026-07-11T22:15:17.000495781Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/1409.7879","arxiv_id":"1409.7879","title":"Collisional effects on the formation of the second solar spectrum of the Sr {\\sc ii} $λ$4078 line","abstract":"This work aims to provide key elements to gain better understanding of the formation of the second solar spectrum of the Sr II $λ$4078 line. We show that in a certain range of hydrogen density, the effect of isotropic collisions between Sr II ions with hydrogen atoms is important in determining the polarization of the Sr II $λ$4078 line. The use of an atomic model that neglects the metastable level 4d of Sr II can induce errors of up to 25 \\% in the value of the scattering polarization of the solar Sr II $λ$4078 line.","url_abs":"https://arxiv.org/abs/1409.7879v1","url_pdf":"https://arxiv.org/pdf/1409.7879v1","authors":"C. Deb, M. Derouich","published":"2014-09-28T08:52:17Z","has_code":false}