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Title:INFRARED SPECTRUM OF N-OXIDOHYDROXYLAMINE [•ONH(OH)] PRODUCED IN REACTION H + HONO IN SOLID PARA-HYDROGEN
Author(s):Lee, Yuan-Pern
Contributor(s):Haupa, Karolina Anna
Subject(s):Astronomy
Abstract:Hydrogenation reactions in the N/O chemical network are important for an understanding of the mechanism of formation of organic molecules in dark interstellar clouds, but many reactions remain unknown. We present the results of the reaction H + HONO in solid ${para}$-hydrogen (${p}$-H$_{2}$) at 3.3 K investigated with infrared spectra. Two methods that produced hydrogen atoms were the irradiation of HONO molecules in ${p}$-H$_{2}$ at 365 nm to produce OH radicals that reacted readily with nearby H$_{2}$ to produce mobile H atoms, and irradiation of Cl$_{2}$ molecules (co-deposited with HONO) in ${p}$-H$_{2}$ at 405 nm to produce Cl atoms that reacted readily with nearby H$_{2}$ to produce mobile H atoms. In both experiments, we assigned IR lines at 3549.6 (nub{1}), 1465.0 (nub{3}), 1372.2 (nub{4}), 895.6/898.5 (nub{6}), and 630.9 (nub{7}) wn to N-oxidohydroxylamine [•ONH(OH)], the primary product of HONO hydrogenation. The assignments were derived according to the consideration of possible reactions and comparison of observed vibrational wavenumbers and their IR intensities with values predicted with the B3LYP/aug-cc-pVTZ method of quantum-chemical calculations. The agreement between observed and calculated D/H- and $^{15}$N/$^{14}$N-isotopic ratios further supports these assignments. The role of this reaction in the N/O chemical network in dark interstellar clouds is discussed.
Issue Date:6/21/2017
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/97056
DOI:10.15278/isms.2017.WA11
Date Available in IDEALS:2017-07-27


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