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Thermal desorption of formamide and methylamine from graphite and amorphous water ice surfaces

Published online by Cambridge University Press:  12 October 2020

Henda Chaabouni Open the ORCID record for Henda Chaabouni [Opens in a new window] ,
Stephan Diana  and
Thanh Nguyen
Henda Chaabouni
Affiliation:
LERMA, UMR8112 du CNRS, de l’Observatoire de Paris et de Université de Cergy-Pontoise. University of Cergy-Pontoise, 5 mail Gay Lussac, 95000 Cergy-Pontoise Cedex, France email: [email protected]
Stephan Diana
Affiliation:
LERMA, UMR8112 du CNRS, de l’Observatoire de Paris et de Université de Cergy-Pontoise. University of Cergy-Pontoise, 5 mail Gay Lussac, 95000 Cergy-Pontoise Cedex, France email: [email protected]
Thanh Nguyen
Affiliation:
LERMA, UMR8112 du CNRS, de l’Observatoire de Paris et de Université de Cergy-Pontoise. University of Cergy-Pontoise, 5 mail Gay Lussac, 95000 Cergy-Pontoise Cedex, France email: [email protected]
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Abstract

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Thermal desorption experiments of Formamide (NH2CHO) and methylamine (CH3NH2) were performed in LERMA-Cergy laboratory to determine the values of the desorption energies of formamide and methylamine from analogues of interstellar dust grain surfaces, and to understand their interaction with water ice. We found that more than 95 % of solid NH2CHO diffuses through the np-ASW ice surface towards the graphitic substrate, and is released into the gas phase with a desorption energy distribution Edes = (7460 – 9380) K, measured with the best-fit pre-exponential factor A=1018 s-1. Whereas, the desorption energy distribution of methylamine from the np-ASW ice surface (Edes =3850-8420 K) is measured with the best-fit pre-exponential factor A=1012s-1. A fraction of solid methylamine, of about 0.15 monolayer diffuses through the water ice surface towards the HOPG substrate, and desorbs later, with higher binding energies (5050-8420 K), which exceed that of the crystalline water ice (Edes =4930 K), calculated with the same pre-exponential factor A=1012 s-1.

Keywords

Astrochemistrymolecular processesmethods: laboratoryISMdiffusion
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 370 - 371
Copyright
© International Astronomical Union 2020

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