TY - GEN
T1 - Hydrogen Reactions and IR Spectroscopy of Molecules of Astrophysical Interest in Para-Hydrogen Matrices
AU - Joshi, Prasad Ramesh
AU - Lee, Yuan Pern
N1 - Publisher Copyright:
© 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2023
Y1 - 2023
N2 - Solid para-hydrogen (p-H2) has been demonstrated to be an excellent matrix host for studying reactions involving H atoms at low temperature, especially in darkness. We first briefly reviewed our previous work on the reactions of astrochemical species with hydrogen atoms in solid p-H2 at 3.2 K. This includes methanol, methyl formate, formamide, acetamide, acetic acid, and glycine. The previously overlooked H-abstraction reactions occurred in all cases. We then present preliminary results of the reaction of H atoms with methylamine CH3NH2. We observed IR spectra of •CH2NH2 and CH2NH upon irradiation and when the matrix was maintained in darkness. Experiments on CD3NH2 produced, in addition to •CD2NH2 and CD2NH, CHD2NH2, confirming the occurrence of H addition to •CD2NH2. The observed mechanism containing two consecutive H-abstraction and two H-addition steps chemically connects CH3NH2 and CH2NH so that they might reach quasi-equilibrium. In addition, the observed infrared spectra can be useful to analyze observations from ground-based telescopes and James Webb Space Telescope.
AB - Solid para-hydrogen (p-H2) has been demonstrated to be an excellent matrix host for studying reactions involving H atoms at low temperature, especially in darkness. We first briefly reviewed our previous work on the reactions of astrochemical species with hydrogen atoms in solid p-H2 at 3.2 K. This includes methanol, methyl formate, formamide, acetamide, acetic acid, and glycine. The previously overlooked H-abstraction reactions occurred in all cases. We then present preliminary results of the reaction of H atoms with methylamine CH3NH2. We observed IR spectra of •CH2NH2 and CH2NH upon irradiation and when the matrix was maintained in darkness. Experiments on CD3NH2 produced, in addition to •CD2NH2 and CD2NH, CHD2NH2, confirming the occurrence of H addition to •CD2NH2. The observed mechanism containing two consecutive H-abstraction and two H-addition steps chemically connects CH3NH2 and CH2NH so that they might reach quasi-equilibrium. In addition, the observed infrared spectra can be useful to analyze observations from ground-based telescopes and James Webb Space Telescope.
KW - Hydrogen reaction
KW - Methyl amine
KW - Para-hydrogen
UR - http://www.scopus.com/inward/record.url?scp=85172414077&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-29003-9_18
DO - 10.1007/978-3-031-29003-9_18
M3 - Conference contribution
AN - SCOPUS:85172414077
SN - 9783031290022
T3 - Astrophysics and Space Science Proceedings
SP - 169
EP - 175
BT - European Conference on Laboratory Astrophysics ECLA2020 - The Interplay of Dust, Ice, and Gas in Space
A2 - Mennella, Vito
A2 - Joblin, Christine
PB - Springer Science and Business Media B.V.
T2 - European Conference on Laboratory Astrophysics, ECLA 2020
Y2 - 26 September 2021 through 1 October 2021
ER -