Indirect rotational spectroscopy of the D2H+ molecular ion

Markus, Charles R.

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https://hdl.handle.net/2142/100795 Copy

Description

Title

Indirect rotational spectroscopy of the D2H+ molecular ion

Author(s)

Markus, Charles R.

Contributor(s)

• McCall, Benjamin J.
• Kocheril, Philip A.

Issue Date

2018-06-19

Keyword(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 D2H+/H + 3 and H2D+/H + 3 to be orders of magnitude greater than that of HD/H2. a Unlike H + 3 , D2H+ and H2D+ have permanent dipole moments and their allowed rotational transitions can be used to probe interstellar conditions and give an indirect method of detection for H + 3 . There are still unobserved transitions of D2H+ 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 D2H+ with MHz-level uncertainty using the technique Noise-Immune Cavity-Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS).b 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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100795

DOI

10.15278/isms.2018.TL05

Copyright and License Information

Copyright 2018 Charles R. Markus

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