Polarization and isotropic collisions with electrons in the solar atmosphere

Derouich, M.; Alruhaili, Aied; Badruddin,

doi:10.1016/j.newast.2019.03.002

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…This long-term problem was strongly emphasized by the solar community (e.g., Trujillo Bueno et al 2006). Since the beginning of the 2000s, the urgent need for collisional molecular data was highlighted, but from that time until now, only very few works focused on investigating this prob-112-2 lem (see Derouich 2006;Derouich et al 2019;Qutub et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Are collisions with electrons important for modeling the polarization of the lines of the C₂ solar molecule?

Derouich

Ahmad

Alruhaili

et al. 2020

Res. Astron. Astrophys.

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Observations of the second solar spectrum (SSS) revealed the existence of prominent linear polarization signals due to lines of the C2 molecule. Interpretation of the SSS is the only tool to obtain the weak and turbulent magnetic field which is widespread in the Quiet Sun. However, this interpretation is conditioned by the determination of accurate collisional data. In this context, we present a formulation of the problem of the calculation of the polarization transfer rates by collisions of polarized C2 states with electrons. The obtained formulae are applied to determine, for the first time, the polarization transfer rates between the C2 states of the Swan band electronic system (a 3Π u – d 3Π g ) and electrons for temperatures going up from 1000 to 10 000 K. However, due to the closeness of the electronic states of the C2 molecule, the two electronic d 3Π g and a 3Π u cannot be disconnected from the other electronic levels and, thus, a model based on only two states is not sufficient to describe the formation of the lines in the Swan band. Consequently, we also calculated the collisional polarization transfer rates in the case where the first eight electronic states of C2 are taken into account. All rates are given as functions of the temperature by power laws. Our results should be useful for future solar applications.

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Section: Introductionmentioning

confidence: 99%

Are collisions with electrons important for modeling the polarization of the lines of the C₂ solar molecule?

Derouich

Ahmad

Alruhaili

et al. 2020

Res. Astron. Astrophys.

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Computations of the multipole cross sections for directional excitation of ions by electron impact

2021

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Polarization Transfer Rates by Isotropic Collisions between Astrophysical SiO Molecule and Electrons

et al. 2022

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We are interested in quantum calculations of polarization transfer (PT) rates due to collisions of the SiO molecule with the electrons. We determine the inelastic PT rates associated to the transitions: X 1Σ+→3Π; X 1Σ+→3Σ+; X 1Σ+→3Δ; X 1Σ+→3Σ−. In addition, we calculate the elastic PT rates due to rotational transitions inside the electronic state X 1Σ+ which are related to observed astronomical SiO MASERs. Our PT rates are obtained through linear combination of excitation rates previously calculated for SiO-electron collisions. The calculations are performed on a collision energy grid large enough to ensure converged state-to-state rates for temperatures ranging from 1000 to 10,000 K for inelastic rates and from 5 to 5000 K for elastic rates. The dependence of the inelastic rates on temperatures is obtained analytically and given in useful form.

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Polarization and isotropic collisions with electrons in the solar atmosphere

Cited by 3 publications

References 18 publications

Are collisions with electrons important for modeling the polarization of the lines of the C₂ solar molecule?

Are collisions with electrons important for modeling the polarization of the lines of the C₂ solar molecule?

Computations of the multipole cross sections for directional excitation of ions by electron impact

Polarization Transfer Rates by Isotropic Collisions between Astrophysical SiO Molecule and Electrons

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Polarization and isotropic collisions with electrons in the solar atmosphere

Cited by 3 publications

References 18 publications

Are collisions with electrons important for modeling the polarization of the lines of the C2 solar molecule?

Are collisions with electrons important for modeling the polarization of the lines of the C2 solar molecule?

Computations of the multipole cross sections for directional excitation of ions by electron impact

Polarization Transfer Rates by Isotropic Collisions between Astrophysical SiO Molecule and Electrons

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Are collisions with electrons important for modeling the polarization of the lines of the C₂ solar molecule?

Are collisions with electrons important for modeling the polarization of the lines of the C₂ solar molecule?