Gas phase formation of c-SiC3 molecules in the circumstellar envelope of carbon stars

doi:10.1073/pnas.1810370116

CORC > 国家天文台 > 中国科学院国家天文台

	Gas phase formation of c-SiC3 molecules in the circumstellar envelope of carbon stars
	Yang, Tao 1,2; Bertels, Luke 3; Dangi, Beni B.2,6; Li, Xiaohu 4,5; Head-Gordon, Martin 3; Kaiser, Ralf I.2
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2019-07-16
卷号	116 期号:29 页码:14471-14478
关键词	reaction dynamics circumstellar envelopes organosilicon molecules astrochemistry
ISSN号	0027-8424
DOI	10.1073/pnas.1810370116
英文摘要	Complex organosilicon molecules are ubiquitous in the circumstellar envelope of the asymptotic giant branch (AGB) star IRC+10216, but their formation mechanisms have remained largely elusive until now. These processes are of fundamental importance in initiating a chain of chemical reactions leading eventually to the formation of organosilicon molecules-among them key precursors to silicon carbide grains-in the circumstellar shell contributing critically to the galactic carbon and silicon budgets with up to 80% of the ejected materials infused into the interstellar medium. Here we demonstrate via a combined experimental, computational, and modeling study that distinct chemistries in the inner and outer envelope of a carbon star can lead to the synthesis of circumstellar silicon tricarbide (c-SiC3) as observed in the circumstellar envelope of IRC+10216. Bi-molecular reactions of electronically excited silicon atoms (Si(D-1)) with allene (H2CCCH2) and methylacetylene (CH3CCH) initiate the formation of SiC3H2 molecules in the inner envelope. Driven by the stellar wind to the outer envelope, subsequent photodissociation of the SiC3H2 parent operates the synthesis of the c-SiC3 daughter species via dehydrogenation. The facile route to silicon tricarbide via a single neutral-neutral reaction to a hydrogenated parent molecule followed by photochemical processing of this transient to a bare silicon-carbon molecule presents evidence for a shift in currently accepted views of the circumstellar organosilicon chemistry, and provides an explanation for the previously elusive origin of circumstellar organosilicon molecules that can be synthesized in carbon-rich, circumstellar environments.
资助项目	Fundamental Research Funds for the Central Universities ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project)[B12024] ; High-end Foreign Expert Project[GDW20183100101] ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; National Science Foundation (NSF)[CHE-1360658] ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate[NNH13ZDA017C] ; NSF[DGE-1106400] ; National Natural Science Foundation of China[11543002] ; FAST FELLOWSHIP ; Special Funding for Advanced Users
WOS关键词	DENSITY-FUNCTIONAL THEORY ; INTERSTELLAR-MEDIUM ; CHAIN MOLECULES ; EVOLVED STARS ; CHEMISTRY ; SILICON ; BEAM ; SIC3 ; IDENTIFICATION ; RADICALS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000475610000017
资助机构	Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; High-end Foreign Expert Project ; High-end Foreign Expert Project ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FAST FELLOWSHIP ; FAST FELLOWSHIP ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; High-end Foreign Expert Project ; High-end Foreign Expert Project ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FAST FELLOWSHIP ; FAST FELLOWSHIP ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; High-end Foreign Expert Project ; High-end Foreign Expert Project ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FAST FELLOWSHIP ; FAST FELLOWSHIP ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; High-end Foreign Expert Project ; High-end Foreign Expert Project ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FAST FELLOWSHIP ; FAST FELLOWSHIP ; Special Funding for Advanced Users ; Special Funding for Advanced Users
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27029]
专题	中国科学院国家天文台
通讯作者	Yang, Tao; Head-Gordon, Martin; Kaiser, Ralf I.
作者单位	1.East China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China 2.Univ Hawaii Manoa, Dept Chem, Honolulu, HI 96822 USA 3.Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Florida A&M Univ, Dept Chem, Tallahassee, FL 32307 USA
推荐引用方式 GB/T 7714	Yang, Tao,Bertels, Luke,Dangi, Beni B.,et al. Gas phase formation of c-SiC3 molecules in the circumstellar envelope of carbon stars[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(29):14471-14478.
APA	Yang, Tao,Bertels, Luke,Dangi, Beni B.,Li, Xiaohu,Head-Gordon, Martin,&Kaiser, Ralf I..(2019).Gas phase formation of c-SiC3 molecules in the circumstellar envelope of carbon stars.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(29),14471-14478.
MLA	Yang, Tao,et al."Gas phase formation of c-SiC3 molecules in the circumstellar envelope of carbon stars".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.29(2019):14471-14478.