SIMBAD references

2018ApJ...860..108B - Astrophys. J., 860, 108-108 (2018/June-3)

A combined experimental and theoretical study on the formation of interstellar propylene oxide (CH3CHCH2O)-A chiral molecule.

BERGANTINI A., ABPLANALP M.J., POKHILKO P., KRYLOV A.I., SHINGLEDECKER C.N., HERBST E. and KAISER R.I.

Abstract (from CDS):

This work reveals via a combined experimental, computational, and astrochemical modeling study that racemic propylene oxide (c-C3H6O)-the first chiral molecule detected outside Earth toward the high-mass star-forming region Sagittarius B2(N)-can be synthesized by non-equilibrium reactions initiated by the effects of secondary electrons generated in the track of cosmic rays interacting with ice-coated interstellar grains through excited-state and spin-forbidden reaction pathways operating within low-temperature interstellar ices at 10 K. Our findings confront traditional hypotheses that thermal chemistries followed by processing of interstellar grains dictate the formation of complex organic molecules (COMs) in molecular clouds. Instead, we reveal a hitherto poorly quantified reaction class involving excited-state and spin-forbidden chemistry leading to racemic mixtures of COMs inside interstellar ices prior to their sublimation in star-forming regions. This fundamental production mechanism is of essential consequence in aiding our understanding of the origin and evolution of chiral molecules in the universe.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrochemistry - cosmic rays - infrared: general - ISM: molecules - methods: laboratory: solid state - radiation mechanisms: non-thermal

Simbad objects: 3

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2020.01.28-09:38:40

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