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An Experimental Study of Chemical Desorption for Phosphine in Interstellar Ice

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Title: An Experimental Study of Chemical Desorption for Phosphine in Interstellar Ice
Authors: Nguyen, Thanh Browse this author
Oba, Yasuhiro Browse this author
Shimonishi, Takashi Browse this author
Kouchi, Akira Browse this author →KAKEN DB
Watanabe, Naoki Browse this author →KAKEN DB
Keywords: Dense interstellar clouds
Interstellar dust processes
Pre-biotic astrochemistry
Issue Date: Aug-2020
Publisher: IOP Publishing
Journal Title: Astrophysical journal letters
Volume: 898
Issue: 2
Start Page: L52
Publisher DOI: 10.3847/2041-8213/aba695
Abstract: Phosphine (PH3), an important molecule for the chemistry of phosphorus (P)-bearing species in the interstellar medium (ISM) is considered to form primarily on interstellar grains. However, no report exists on the processes of PH(3)formation on grains. Here, we experimentally studied the reactions of hydrogen (H) atoms and PH(3)molecules on compact amorphous solid water, with a particular focus on the chemical desorption of PH(3)at 10-30 K. After exposure to H atoms for 120 minutes, up to 50% of solid PH(3)was lost from the icy surface. On the basis of experiments using deuterium atoms, it was concluded that the loss of PH(3)resulted from chemical desorption through the reactions PH3+ H -> PH2 + H(2)and/or PH2+ H -> PH3. The effective desorption cross-section was similar to 5 x 10(-17)cm(2), which is three times larger than that of hydrogen sulfide measured under similar experimental conditions. The present results suggest that the formation of PH3, and possibly PH(2)and PH, followed by their desorption from icy grains, may contribute to the formation of PN and PO in the gas phase, and thus may play a role in the P chemistry of the ISM.
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)

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