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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29305
Title: Interstellar dimethyl ether gas-phase formation: a quantum chemistry and kinetics study
Authors: Skouteris, Dimitrios
Balucani, Nadia
Ceccarelli, Cecilia
Faginas Lago, Noelia
CODELLA, CLAUDIO 
Falcinelli, Stefano
Rosi, Marzio
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 482
Issue: 3
First Page: 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
Appears in Collections:1.01 Articoli in rivista

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