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An experimental study of photochemistry for phosphine on interstellar silicate dust

研究課題

研究課題/領域番号 21K13974
研究種目

若手研究

配分区分基金
審査区分 小区分17010:宇宙惑星科学関連
研究機関北海道大学

研究代表者

NGUYEN THANH  北海道大学, 低温科学研究所, 博士研究員 (40846599)

研究期間 (年度) 2021-04-01 – 2022-03-31
研究課題ステータス 中途終了 (2021年度)
配分額 *注記
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2022年度: 1,560千円 (直接経費: 1,200千円、間接経費: 360千円)
2021年度: 3,120千円 (直接経費: 2,400千円、間接経費: 720千円)
キーワードAstrochemistry / Interstellar medium / Amorphous silicate / Photochemistry / Phosphine / Astrochemitry / Molecular cloud / Bare silicate dust
研究開始時の研究の概要

Photochemistry of PH3 and PH3-containing ices (i.e., PH3/H2O, PH3/CO, and PH3/NH3) will be investigated by using UV photons on a Mg2SiO4 substrate at different temperatures. Photoproducts formed from photodissociation of PH3 and PH3-containing ices may react to form new P-bearing species such as P2H4, PN, PO, HPCO, HPO and/or H3PO4 on the Mg2SiO4 substrate. The decrease of PH3, PH3-containing ices, and the formation of new P-bearing molecules will be detected and recorded through using Fourier-transform infrared (FTIR) spectrometer and quadruple mass spectrometer (QMS), respectively.

研究実績の概要

The purpose is to study the photochemistry of phosphine and PH3 containing ices on bare silicate dust at low temperatures (typically 10 K).
Firstly, I carried out experiments on the photochemical reactions of PH3 on amorphous forsterite (Mg2SiO4), which is expected to be dominant components of interstellar grains, at 10K. I obtained the missing PH3 on Mg2SiO4 at 10K by photodissociation after UV photolysis following reactions: PH3 + hv → PH2 + H; simultaneously, a small trace of P2H4 could be formed from PH2 + PH2 → P2H4 reaction. I also carried out another experiment of PH3 photolysis on water ice at 10 K to compare to the effective photodesorption of PH3 on Mg2SiO4. Based on the effective photodesorption of PH3, I may remark that the different effective photodesorption of PH3 on Mg2SiO4 and on water ice is due to the big different binding energy on different surfaces.
Secondly, I surveyed the photolysis of PH3/CO binary on Mg2SiO4. After photodissociation of PH3/CO binary on Mg2SiO4 in 2 hours, I got some products as HCO, H2CO, and HPCO. HCO and H2CO were formed from CO + H reaction; in there, H atoms were produced from the photodissociation of PH3. Furthermore, HPCO, which should be formed from PH + CO → HPCO reaction, has been detected. Additional, HPCO is a phosphorus containing analogues of isocyanic Acid which has been proposed to exit in interstellar space, but it has not been detected there. My experimental result, therefore, may contribute to study the complex phosphorus molecules on bare silicate dust.

報告書

(1件)
  • 2021 実績報告書
  • 研究成果

    (3件)

すべて 2021 その他

すべて 雑誌論文 (2件) (うち査読あり 2件、 オープンアクセス 2件) 備考 (1件)

  • [雑誌論文] Successive H-atom Addition to Solid OCS on Compact Amorphous Solid Water2021

    • 著者名/発表者名
      Nguyen Thanh、Oba Yasuhiro、Sameera W. M. C.、Kouchi Akira、Watanabe Naoki
    • 雑誌名

      The Astrophysical Journal

      巻: 922 号: 2 ページ: 146-146

    • DOI

      10.3847/1538-4357/ac2238

    • 関連する報告書
      2021 実績報告書
    • 査読あり / オープンアクセス
  • [雑誌論文] Experimental and Computational Studies on the Physicochemical Behavior of Phosphine Induced by Reactions with H and D Atoms on Interstellar Ice Grains2021

    • 著者名/発表者名
      T. Nguyen , Y. Oba , W. M. C. Sameera , A. Kouchi , N.Watanabe
    • 雑誌名

      The Astrophysical Journal

      巻: 918

    • 関連する報告書
      2021 実績報告書
    • 査読あり / オープンアクセス
  • [備考] Astrophysical Chemistry /Ice& Planetary Science

    • URL

      http://www.lowtem.hokudai.ac.jp/astro/index.html

    • 関連する報告書
      2021 実績報告書

URL: 

公開日: 2021-04-28   更新日: 2022-12-28  

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