Collisional Excitation and Non-LTE Modeling of Interstellar Chiral Propylene Oxide

Dzenis, Karlis; Faure, Alexandre; McGuire, B. A.; Remijan, A. J.; Dagdigian, P. J.; Rist, C.; Dawes, R.; Quintas-Sánchez, E.; Lique, F.; Hochlaf, M.

doi:10.3847/1538-4357/ac43b5

Title: Collisional Excitation and Non-LTE Modeling of Interstellar Chiral Propylene Oxide

Journal Article · Tue Feb 08 00:00:00 EST 2022 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/ac43b5· OSTI ID:1844255

;

; Rist, C.; Dawes, R.; Quintas-Sánchez, E.;

; Hochlaf, M.

Abstract The first set of theoretical rotational cross sections for propylene oxide (CH ₃ CHCH ₂ O) colliding with cold He atoms has been obtained at the full quantum level using a high-accuracy potential energy surface. By scaling the collision reduced mass, rotational rate coefficients for collisions with para-H ₂ are deduced in the temperature range 5–30 K. These collisional coefficients are combined with radiative data in a non-LTE radiative transfer model in order to reproduce observations of propylene oxide made toward the Sagittarius B2(N) molecular cloud with the Green Bank and Parkes radio telescopes. The three detected absorption lines are found to probe the cold (∼10 K) and translucent ( n _H ∼ 2000 cm ⁻³ ) gas in the outer edges of the extended Sgr B2(N) envelope. The derived column density for propylene oxide is N _tot ∼ 3 × 10 ¹² cm ⁻² , corresponding to a fractional abundance relative to total hydrogen of ∼2.5 × 10 ⁻¹¹ . The present results are expected to help our understanding of the chemistry of propylene oxide, including a potential enantiomeric excess, in the cold interstellar medium.

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Research Organization:: Univ. of Missouri, Rolla, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC); French INSU/CNRS Program

Grant/Contract Number:: DESC0019740; SC0019740

OSTI ID:: 1844255

Alternate ID(s):: OSTI ID: 1864685

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Vol. 926 Journal Issue: 1; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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