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http://hdl.handle.net/20.500.12386/29305
Titolo: | Interstellar dimethyl ether gas-phase formation: a quantum chemistry and kinetics study | Autori: | Skouteris, Dimitrios Balucani, Nadia Ceccarelli, Cecilia Faginas Lago, Noelia CODELLA, CLAUDIO Falcinelli, Stefano Rosi, Marzio |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 482 | Fascicolo: | 3 | Da pagina:: | 3567 | Abstract: | Dimethyl ether is one of the most abundant interstellar complex organic molecules. Yet its formation route remains elusive. In this work, we have performed electronic structure and kinetics calculations to derive the rate coefficients for two ion-molecule reactions recently proposed as a gas-phase formation route of dimethyl ether in interstellar objects, namely CH<SUB>3</SUB>OH + CH<SUB>3</SUB>OH_2^+ → (CH<SUB>3</SUB>)<SUB>2</SUB>OH<SUP>+</SUP> + H<SUB>2</SUB>O followed by (CH<SUB>3</SUB>)<SUB>2</SUB>OH<SUP>+</SUP> + NH<SUB>3</SUB> → CH<SUB>3</SUB>OCH<SUB>3</SUB> + NH_4^+. A comparison with previous experimental rate coefficients for the reaction CH<SUB>3</SUB>OH + CH<SUB>3</SUB>OH_2^+ sustains the accuracy of the present calculations and allows a more reliable extrapolation at the low temperatures of interest in interstellar objects (10-100 K). The rate coefficient for the reaction (CH<SUB>3</SUB>)<SUB>2</SUB>OH<SUP>+</SUP> + NH<SUB>3</SUB> is, instead, provided for the first time ever. The rate coefficients derived in this work essentially confirm the prediction by Taquet, Wirström & Charnley concerning dimethyl ether formation in hot cores/corinos. Nevertheless, this formation route cannot be efficient in cold objects (like pre-stellar cores) where dimethyl ether is also detected, because ammonia has a very low abundance in those environments. | URI: | http://hdl.handle.net/20.500.12386/29305 | URL: | https://arxiv.org/pdf/1810.10407.pdf https://academic.oup.com/mnras/article/482/3/3567/5145851 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty2903 | Bibcode ADS: | 2019MNRAS.482.3567S | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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