Laser spectroscopy of vinyl alcohol embedded in helium droplets

Bunn, Hayley

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https://hdl.handle.net/2142/97187 Copy

Description

Title

Laser spectroscopy of vinyl alcohol embedded in helium droplets

Author(s)

Bunn, Hayley

Contributor(s)

• Douberly, Gary E.
• Raston, Paul

Issue Date

2017-06-23

Keyword(s)

Vibrational structure/frequencies

Abstract

Vinyl alcohol has two rotameric forms, known as textit{syn}- and textit{anti}-vinyl alcohol, where textit{syn} is the most stable. While both have been investigated by microwavefootnote{M. Rodler, J. Mol. Spec. 114, 23 (1985);S. Saito, Chem. Phys. Lett. 42, 3 (1976)} and far-infraredfootnote{H. Bunn, R. Hudson, A. S. Gentleman, and P. L. Raston, ACS Earth Space Chem. DOI: 10.1021/acsearthspacechem.6b00008 (2017)} spectroscopy, only the textit{syn} rotamer has been investigated by mid-infrared spectroscopyfootnote{D-L Joo, A. J. Merer, D. J. Clouthier, J. Mol. Spec. 197, 68 (1999)}. This is due to the low textit{anti} rotamer population (15%) at room temperature, in addition to the closeness in proximity of the mid-infrared bands between the rotamers; this results in overlapping bands that are dominated by textit{syn}-vinyl alcohol absorptions. In this investigation we increase the textit{anti}-vinyl alcohol population to ~40% by using a high temperature “pyrolysis” source, and eliminate the spectral overlap by recording the spectra at low temperature in helium nanodroplets. We observe a number of bands of both rotamers in the OH, CH, and CO stretching regions that display rotational substructure. A highlight of this work is the observation of a Fermi dyad in the OH stretching region of textit{anti}-vinyl alcohol. Anharmonic frequency calculations suggest that this is due to a near degeneracy of the OH stretching state (nub{1}) with a triple combination involving nub{7}, nub{8}, and nub{9}._x000d_ _x000d_

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/97187

DOI

https://doi.org/10.15278/isms.2017.FC01

Copyright and License Information

Copyright 2017 Hayley Bunn

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