Broadband FTMW spectroscopy of 2-methylimidazole and complexes with water and argon
Medcraft, Chris
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https://hdl.handle.net/2142/97170
Description
Title
Broadband FTMW spectroscopy of 2-methylimidazole and complexes with water and argon
Author(s)
Medcraft, Chris
Contributor(s)
Walker, Nick
Mullaney, John C.
Heitkämper, Juliane
Issue Date
2017-06-20
Keyword(s)
Large amplitude motions
Internal rotation
Abstract
The rotational spectrum of 2-methylimidazole has been measured using laser ablation chirped-pulse Fourier transform microwave spectroscopy from 2-18.5 GHz. 2-methylimidazole was laser vaporised then entrained within an argon buffer gas undergoing supersonic expansion allowing for efficient rotational cooling. Carbon-13 and nitrogen-15 isotopologues were measured in natural abundance and substitution coordinates have been determined. The barrier to internal rotation of the methyl group was found to be 122.697(20) cm$^{-1}$. Nuclear quadropole coupling constants for the two nitrogen nuclei were determined via a rigid rotor fit of the $A$ internal rotor state. Complexes with water and argon were also observed and fit in a similar way.
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