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Microwave Spectroscopy; Chirped-pulse Fourier Transform Rotational Spectroscopy; Atmospheric Chemistry
Abstract:
The rotational spectra of the two structurally related molecules, 1,4-cineole and 1,8-cineole (eucalyptol), were measured between 2–8.5 GHz with chirped pulse Fourier transform microwave spectroscopy. The structures of these two molecules only differ in the connectivity of an ether functional group. This results in a significant change in the three dimensional structure of the molecule and consequently large differences in the rotational spectra. Only one conformer of each molecule was detected in the molecular jet and no line splittings due to internal rotations were detected. A substitution structure (rs) was determined for eucalyptol and benchmarked to quantum chemical structures allowing for a comparison of eucalyptol and 1,4-cineole.
