Terahertz spectroscopy of cah

Kobayashi, Kaori

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https://hdl.handle.net/2142/107445 Copy

Description

Title

Terahertz spectroscopy of cah

Author(s)

Kobayashi, Kaori

Contributor(s)

• Moriwaki, Yoshiki
• Matsushima, Fusakazu
• Sumi, Tatsuki

Issue Date

2020-06-23

Keyword(s)

Radicals

Abstract

Calcium monohydride CaH is an astronomical molecule identified in the Sun and other stars by using visible transitions. We have found many new vibrational levels of the B/B$'$ state using Laser Induced Fluorescence (LIF) from the visible to ultraviolet region. $\footnote{K. Watanabe, N. Yoneyama, K. Uchida, K. Kobayashi, F. Matsushima, Y. Moriwaki, S. C. Ross, \textit{Chem. Phys. Lett.} \underline{\textbf{657}}, 1 (2016).}$$^,$ $\footnote{K. Watanabe, I. Tani, K. Kobayashi, Y. Moriwaki, S. C. Ross, \textit{Chem. Phys. Lett.} \underline{\textbf{710}}, 11 (2018).}$ In the analysis of these transitions, we fixed the molecular constants in the ground state to those analyzed for the A$^2\Pi$, B$^2\Sigma^+\rightarrow$ X$^2\Sigma^+$ in 12000 - 17000 cm$^{-1}$ region and the $v=v'+1\rightarrow v'$($v'=0-3$) in X$^2\Sigma^+$ transitions by Shayesteh et al. \footnote{A. Shayesteh, R. S. Ram, and P. F. Bernath, \textit{J. Mol. Spectrosc.} \underline{\textbf{288}}, 46 (2013).}$^,$\footnote{A. Shayesteh, K. A. Walker, I. Gordon, D. R. T. Appadoo, and P. F. Bernath, \textit{J. Mol. Struct.}, \underline{695} (2004).} The pure rotational spectra in the ground state have been reported and hyperfine structure was analyzed. $\footnote{ C. I. Frum, J. J. Oh, E. A. Cohen, H. M. Pickett, \textit{ Astrophys. J. Lett.} \underline{\textbf{408}}, L61 (1993).}$ $\footnote{ W. L. Barclay Jr., M. A. Anderson, L. M. Ziurys, \textit{ Astrophys. J. Lett.} \underline{\textbf{408}}, L65 (1993).}$ However, the range was limited up to $N$ = 2-1. the highest frequency was about 500 GHz. In this study, we will report our new measurement in the terahertz region. The spectra were taken by using tunable far-infrared spectrometer at the University of Toyama. Calcium monohydride was produced in a cell where Ca vapor was introduced by heating Ca at 750$^\circ$C and DC discharge was applied under H$_2$ and He gas environment. So far the highest frequency we observed was about 1.5 THz. The accurate rest frequencies and molecular constants will be provided.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/107445

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Copyright 2020 is held by the Author(s)

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