On the correlation of the abundances of HNCO and NH2CHO: Advantages of solid para-H2 to study astrochemical H-atom addition and abstraction reactions. Issue Volume 15:Issue S350(2019) (April 2019)

• Record Type: Journal Article
• Authors: Tarczay, György; Haupa, Karolina; Lee, Yuan-Pern
• Editors: Salama, Farid; Linnartz, Harold
• Is Part Of: Proceedings of the International Astronomical Union. Volume 15:Issue S350(2019)
• Page Start: 394
• Page End: 396
• Publication Date: 2019-04
• Subjects: astrochemistry, -- molecular processes, -- ISM: clouds; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921319008378
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: In dense interstellar clouds that are shielded from high-energy radiation (e.g., UV photons or cosmic rays), H-atom addition and abstraction reactions that take place on grain surfaces play principal roles in the synthesis or decomposition of complex organic molecules (COMs). These reactions are extensively investigated with laboratory experiments by bombarding astrophysical analogue ices with a beam of low-temperature H atoms. Here we demonstrate that, although 2-4 K solid para -H2 does not represent a typical environment of the surface of interstellar grains, para -H2 matrix isolation combined with IR spectroscopy is a complementary tool to sensitively detect astrochemical hydrogenation and dehydrogenation processes.