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Gas phase formation of c-SiC3 molecules in the circumstellar envelope of carbon stars
Yang, Tao1,2; Bertels, Luke3; Dangi, Beni B.2,6; Li, Xiaohu4,5; Head-Gordon, Martin3; Kaiser, Ralf I.2
2019-07-16
Source PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
Volume116Issue:29Pages:14471-14478
AbstractComplex 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.
Corresponding AuthorYang, Tao(tyang@lps.ecnu.edu.cn) ; Head-Gordon, Martin(mhg@cchem.berkeley.edu) ; Kaiser, Ralf I.(ralfk@hawaii.edu)
Keywordreaction dynamics circumstellar envelopes organosilicon molecules astrochemistry
DOI10.1073/pnas.1810370116
Indexed BySCI
Language英语
WOS KeywordDENSITY-FUNCTIONAL THEORY ; INTERSTELLAR-MEDIUM ; CHAIN MOLECULES ; EVOLVED STARS ; CHEMISTRY ; SILICON ; BEAM ; SIC3 ; IDENTIFICATION ; RADICALS
Funding ProjectFundamental 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 Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000475610000017
PublisherNATL ACAD SCIENCES
Funding OrganizationFundamental Research Funds for the Central Universities ; Overseas Expertise Introduction Project for Discipline Innovation (the 111 Project) ; High-end Foreign Expert Project ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning ; National Science Foundation (NSF) ; National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute through the Science Mission Directorate ; NSF ; National Natural Science Foundation of China ; FAST FELLOWSHIP ; Special Funding for Advanced Users
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Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/2917
Collection射电天文研究室_天体化学研究团组
Corresponding AuthorYang, Tao; Head-Gordon, Martin; Kaiser, Ralf I.
Affiliation1.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
Recommended Citation
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.
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