HIGH RESOLUTION INFRARED SPECTRA OF TRIACETYLENE

Doney, Kirstin D.

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https://hdl.handle.net/2142/79434 Copy

Description

Title

HIGH RESOLUTION INFRARED SPECTRA OF TRIACETYLENE

Author(s)

Doney, Kirstin D.

Contributor(s)

• Linnartz, Harold
• Zhao, Dongfeng

Issue Date

25-Jun-15

Keyword(s)

Vibrational structure/frequencies

Abstract

Triacetylene, HC$_{6}$H, is the longest poly-acetylene chain found in space, and is believed to be involved in the formation of longer chain molecules and polycyclic aromatic hydrocarbons (PAHs). However, abundances are expected to be low, and observational confirmation requires knowledge of the gas-phase spectra, which up to now has been incomplete with only the weak, low lying bending modes being known. We present new infrared (IR) spectra in the C-H stretch region obtained using ultra-sensitive and highly precise IR continuous wave cavity ring-down spectroscopy (cw-CRDS), combined with supersonic plasma expansionsfootnote{D. Zhao, J. Guss, A. Walsh, H. Linnartz, Chem. Phys. Lett., 565, 132 (2013)}. The talk reviews the accurate determination of the rotational constants of the asymmetric fundamental mode, $nub{5}$, including discussion on the perturber state, and associated hot bandsfootnote{K.D. Doney, D. Zhao, H. Linnartz, in preparation}. The determined molecular parameters are accurate enough to aid astronomical searches with such facilities as ALMA (Atacama Large Millimeter Array) or the upcoming JWST (James Webb Space Telecscope), which can now probe even trace molecules (abundances of $sim$ 10$^{-6}$ - 10$^{-10}$ with respect to H$_{2}$).

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79434

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