Laser spectroscopy of OCS-water complexes in superfluid helium nanodroplets

Miller, Isaac James

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https://hdl.handle.net/2142/104319 Copy

Description

Title

Laser spectroscopy of OCS-water complexes in superfluid helium nanodroplets

Author(s)

Miller, Isaac James

Contributor(s)

• Raston, Paul
• Faulkner, Ty
• Wells, Tyler

Issue Date

2019-06-19

Keyword(s)

Non-covalent interactions

Abstract

Superfluid helium nanodroplets are particularly useful for synthesizing molecular complexes, and several investigations have focused on investigating the hydration of atmospherically important molecules, such as the hydroxyl radical [1]. While carbonyl sulphide is the most abundant sulphur containing molecule in the atmosphere, little is known experimentally about how it interacts with water. In this study we focus on isolating OCS-(H$_{2}$O)$_{N}$ complexes in helium nanodroplets, and on uncovering their infrared signatures with quantum cascade laser spectroscopy. For the dimer, we identified two isomers, which is consistent with what was observed in solid neon [2]. One of the isomers has C$_{s}$ symmetry with the water near the oxygen end of OCS, and the other has C$_{2v}$ symmetry, with the water at the sulphur end. The latter isomer displays well resolved rotational substructure in its C-O stretching band, and Stark spectroscopy has been performed, which should allow for determination of its dipole moment. Larger clusters seem to build off of the dimers, as evidenced by two sets of infrared bands that grow in with increasing water concentrations, near the corresponding OCS-H$_{2}$O bands. [1] F. J. Hernandez et al. The Journal of Chemical Physics 143, 164304 (2015). [2] P. Soulard et al. The Journal of Chemical Physics 146, 234303 (2017).

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104319

DOI

https://doi.org/10.15278/isms.2019.WH07

Copyright and License Information

Copyright 2019 Isaac James Miller

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