THZ SPECTROSCOPY OF D2H+

Amano, Takayoshi

Permalink

https://hdl.handle.net/2142/79121 Copy

Description

Title

THZ SPECTROSCOPY OF D2H+

Author(s)

Amano, Takayoshi

Contributor(s)

• Pearson, John
• Yu, Shanshan

Issue Date

25-Jun-15

Keyword(s)

Astronomy

Abstract

Pure rotational transitions of D$_2$H$^+$ observed by high-resolution spectroscopy have been limited so far to the $J$ = 1$_{10}$-1$_{01}$ transition at 691.7 GHz,footnote{T. Hirao and T. Amano, textit{Ap. J.},textbf{597}, L85 (2003)} $J=2_{20}-2_{11}$ at 1.370 THz, and $J=1_{11}-0_{00}$ at 1.477 THz.footnote{K. M. Evenson et al cited by O. L. Polyansky and A. R. W. McKellar, textit{J. Chem. Phys.}, textbf{92}, 4039 (1990)}footnote{O. Asvany et al, textit{Phys. Rev. Lett.}, textbf{100}, 233004 (2008)} As this ion is a light asymmetric-top molecule, spectroscopic characterization and prediction of other rotational transition frequencies are not straightforward. In this presentation, we extended the measurements up to 2 THz by using the JPL frequency multiplier chains, and observed three new THz lines and re-measured the three known transitions. D$_2$H$^+$ was generated in an extended negative glow discharge cell cooled to liquid nitrogen temperature. Six rotational transition frequencies together with the combination differences derived from three fundamental bands were subject to least square analysis to determine the molecular constants. New THz measurements are definitely useful for better characterization of spectroscopic properties. The improved molecular constants provide better predictions of other unobserved rotational transitions.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/79121

Owning Collections