An experimental study of photochemistry for phosphine on interstellar silicate dust

星际硅酸盐尘埃中磷化氢的光化学实验研究

• 批准号: 21K13974
• 负责人: NGUYEN THANH
• 金额: $ 3万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K13974/
• 关键词: Astrochemistry; Interstellar medium; Amorphous silicate; Photochemistry; Phosphine; Astrochemitry; Molecular cloud; Bare silicate dust

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.

目的是在裸露的硅酸盐粉尘温度（通常为10 K）上进行光chine和PH3。通过光解在10k上的MG2SIO4上的pH3以下：pH3 + HV→PH2 + H； 10 K到MG2SIO4上的PH3有效的光二位吸收。在2小时内，我在MG2SIO4上获得了一些产品，因为HCO，H2CO和H2CO是FRMCO + H反应。因此，异氰酸的结果可能有助于研究裸硅灰尘上的组分分子。

项目成果

Successive H-atom Addition to Solid OCS on Compact Amorphous Solid Water

致密非晶固体水上的固体 OCS 连续添加氢原子

• DOI: 10.3847/1538-4357/ac2238
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Nguyen Thanh;Oba Yasuhiro;Sameera W. M. C.;Kouchi Akira;Watanabe Naoki
• 通讯作者: Watanabe Naoki

Astrophysical Chemistry /Ice& Planetary Science

天体物理化学/冰

Experimental and Computational Studies on the Physicochemical Behavior of Phosphine Induced by Reactions with H and D Atoms on Interstellar Ice Grains

星际冰粒上 H 和 D 原子反应引起的磷化氢物理化学行为的实验和计算研究

• DOI: 10.3847/1538-4357/ac0cf4
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Nguyen Thanh;Oba Yasuhiro;Sameera W. M. C.;Kouchi Akira;Watanabe Naoki
• 通讯作者: Watanabe Naoki