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 Title: QUANTUM CASCADE LASER SPECTROSCOPY OF CARBONYL SULFIDE AND METHANOL ISOTOPOLOGUES IN HELIUM NANODROPLETS Author(s): Miller, Isaac James Contributor(s): Raston, Paul; Faulkner, Ty Subject(s): Fundamental interest Abstract: Superfluid helium nanodroplets present a unique environment for the investigation of the coupling of solvent density to the rotation of embedded molecules [1]. This coupling results in a reduction of the gas phase rotational constant, \textit{B}$_{gas}$, by an amount that depends on both the gas phase rotational velocity and the anisotropy of the helium-rotor interaction potential [2]. We can gain insight into the dependence of \textit{B}$_{gas}$ on the coupling by investigating different isotopologues of a given molecule, such as HCN/DCN [3] (since the interaction potential is approximately the same between them). With this in mind, we recorded the high-resolution infrared spectra of carbonyl sulfide and methanol isotopologues from 4.7 to 5.0 $\mu$m, using a newly built spectrometer. This spectral region allows for coverage of the CO stretching and third overtone bending bands of carbonyl sulfide, and the symmetric CD$_{3}$ stretching band of methanol. For both systems, we find that the heavier isotopologues couple to more helium density, and explore the connection between the two molecules in terms of their dependence of \textit{B}$_{gas}$ on the amount of coupled helium density. [1] S. Grebenev, J. P. Toennies, and A. F. Vilesov, Science 279, 2083 (1998). [2] S. Paolini, S. Fantoni, S. Moroni, and S. Baroni, J. Chem. Phys. 123, 114306 (2005). [3] A. Conjusteau, C. Callegari, I. Reinhard, K. K. Lehmann, and G. Scoles, J. Chem. Phys. 113, 4840 (2000). Issue Date: 06/22/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100767 DOI: 10.15278/isms.2018.FD09 Other Identifier(s): FD09 Date Available in IDEALS: 2018-08-172018-12-12
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