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Gas-phase reactivity of CH3C(O) CH3 with OH radicals at interstellar Temperatures (T = 11.7 – 64.4 K) using the CRESU technique

Published online by Cambridge University Press:  12 October 2020

Sergio Blázquez Open the ORCID record for Sergio Blázquez [Opens in a new window] ,
Antonio J. Ocaña ,
Alberto García ,
Bernabé Ballesteros ,
André Canosa Open the ORCID record for André Canosa [Opens in a new window] ,
María Antiñolo ,
José Albaladejo  and
Elena Jiménez
Sergio Blázquez
Affiliation:
Departamento de Química Fïsica. Facultad de Ciencias y Tecnologías Químicas. Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B. 13071Ciudad Real, Spain
Antonio J. Ocaña
Affiliation:
Departamento de Química Fïsica. Facultad de Ciencias y Tecnologías Químicas. Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B. 13071Ciudad Real, Spain
Alberto García
Affiliation:
Departamento de Química Fïsica. Facultad de Ciencias y Tecnologías Químicas. Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B. 13071Ciudad Real, Spain
Bernabé Ballesteros
Affiliation:
Departamento de Química Fïsica. Facultad de Ciencias y Tecnologías Químicas. Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B. 13071Ciudad Real, Spain Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA). UCLM, Camino de Moledores s/n. 13071 Ciudad Real, Spain
André Canosa
Affiliation:
Université Rennes, CNRS, IPS (Institut de Physique de Rennes)-UMR 6251, Rennes, F-35000, France emails: sergio.blazquez@uclm.es, elena.jimenez@uclm.es
María Antiñolo
Affiliation:
Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA). UCLM, Camino de Moledores s/n. 13071 Ciudad Real, Spain
José Albaladejo
Affiliation:
Departamento de Química Fïsica. Facultad de Ciencias y Tecnologías Químicas. Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B. 13071Ciudad Real, Spain Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA). UCLM, Camino de Moledores s/n. 13071 Ciudad Real, Spain
Elena Jiménez
Affiliation:
Departamento de Química Fïsica. Facultad de Ciencias y Tecnologías Químicas. Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B. 13071Ciudad Real, Spain Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA). UCLM, Camino de Moledores s/n. 13071 Ciudad Real, Spain
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Abstract

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The rate coefficients, k(T= 11.7 – 64.4 K), for the gas-phase reaction between OH radicals and acetone, CH3C(O) CH3, have been measured using the pulsed CRESU (French acronym for Reaction Kinetics in a Uniform Supersonic Flow) technique, the most suitable one to cool down gases below the freezing point without gas condensation. The experimental k(T) was found to increase as temperature was lowered and is several orders of magnitude higher for low temperature than k(300 K). No pressure dependence of k(20 K) and k(64 K) was observed, while k(50 K) at the largest gas density is twice higher than the average values found at lower gas densities. The obtained values of k(11.7 K) and k(21.1 K) were 2.45’10-10 and 1.39’10-10 cm3 molecule-1 s-1, respectively.

Keywords

astrochemistrymethods: laboratoryISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 379 - 381
Copyright
© International Astronomical Union 2020

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