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Formation of chiral CO polyhedral crystals on icy interstellar grains

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Title: Formation of chiral CO polyhedral crystals on icy interstellar grains
Authors: Kouchi, Akira Browse this author →KAKEN DB
Tsuge, Masashi Browse this author
Hama, Tetsuya Browse this author
Niinomi, Hiromasa Browse this author →KAKEN DB
Nakatani, Naoki Browse this author
Shimonishi, Takashi Browse this author
Oba, Yasuhiro Browse this author
Kimura, Yuki Browse this author →KAKEN DB
Sirono, Sin-iti Browse this author
Okuzumi, Satoshi Browse this author
Momose, Munetake Browse this author
Furuya, Kenji Browse this author
Watanabe, Naoki Browse this author →KAKEN DB
Keywords: astrochemistry
method: laboratory: solid-state
ISM: dust
Issue Date: Jul-2021
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 505
Issue: 1
Start Page: 1530
End Page: 1542
Publisher DOI: 10.1093/mnras/stab1173
Abstract: The crystallinity and morphology of solid carbon monoxide (CO) on icy interstellar grains were examined by observing the deposition, crystallization, and UV and electrons irradiation of solid CO using transmission electron microscopy. Herein, we found that solid CO deposited in molecular clouds was crystalline, and that even if amorphous CO was deposited, amorphous CO crystallized within 10(3) yr at 10 K. Conversely, crystalline CO was not amorphized by UV rays or electron beam at 10 K. These results indicated the occurrence of chiral crystalline CO instead of amorphous CO in space. Furthermore, the large surface diffusion coefficients of CO on eamorphous H2O and crystalline CO at 10 K facilitated the morphological equilibration of crystalline CO. Bad wetting of crystalline CO with amorphous H2O proved that the morphology of the ice grains was not spherical with an onion-like structure, as hitherto assumed, but rather it was a polyhedral crystalline CO attached to amorphous H2O. This has important implications for phenomena associated with the collision and subsequent sticking between ice grains, surface chemical reactions, non-thermal desorption of molecules and the origin of homochirality in interstellar biomolecules.
Rights: This article has been accepted for publication in Monthly notices of the royal astronomical society ©:2021 Akira Kouchi Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 香内 晃

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