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Title:INDIRECT ROTATIONAL SPECTROSCOPY OF THE D2H+ MOLECULAR ION
Author(s):Markus, Charles R.
Contributor(s):McCall, Benjamin J.; Kocheril, Philip A.
Subject(s):Astronomy
Abstract:The partially deuterated isotopologues of H$_3^+$ have proven to be valuable probes of interstellar environments. In low temperature regions ($< 20$ K) such as dark molecular clouds, deuterium fractionation leads the ratios of \chem{D_2H^+}/\chem{H_3^+} and \chem{H_2D^+}/\chem{H_3^+} to be orders of magnitude greater than that of HD/\chem{H_2}.\footnote{H. Roberts, E. Herbst, and T. J. Millar, \textit{Astrophys. J.}, \textbf{591}, L41 (2003). } Unlike \chem{H_3^+}, \chem{D_2H^+} and \chem{H_2D^+} have permanent dipole moments and their allowed rotational transitions can be used to probe interstellar conditions and give an indirect method of detection for \chem{H_3^+}. There are still unobserved transitions of \chem{D_2H^+} that are within the coverage of observatories such as the Stratospheric Observatory for Infrared Astronomy (SOFIA) which have relatively large uncertainties (8--16 MHz). Recently, we have measured over 20 rovibrational transitions of \chem{D_2H^+} with MHz-level uncertainty using the technique Noise-Immune Cavity-Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS).\footnote{J. N. Hodges, A. J. Perry, P. A. Jenkins II, B. M. Siller, and B. J. McCall, \textit{J. Chem. Phys}, \textbf{139}, 164201 (2013).} These new measurements can be used to improve predicted frequencies of pure rotational transitions using combination differences and an improved fit to an effective Hamiltonian.
Issue Date:06/19/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100795
DOI:10.15278/isms.2018.TL05
Other Identifier(s):TL05
Date Available in IDEALS:2018-08-17
2018-12-12


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