High throughput chirped pulse Fourier-transform microwave spectroscopy of ethanol and water clusters

Creators: Dutton, S. E.; Blake, G. A.

Abstract

Here we discuss the design and performance of a novel high-throughput instrument for Chirped Pulse Fourier-transform Microwave (CP-FTMW) spectroscopy, and demonstrate its efficacy through the identification of the lowest energy conformers of the ethanol trimer and mixed water : ethanol trimers. Rotational constants for these trimers were calculated from observed lines in the spectra from 10 to 14 GHz, and compared to the results of anharmonic ab initio computations. As predicted, all trimers share a cyclic donor–acceptor hydrogen bonding structure, with the ethanol monomer favoring the gauche conformation in the lowest energy structures. The increased speed of data collection and resulting sensitivity opens a new avenue into rotational studies of higher order clusters.

Additional Information

© the Owner Societies 2022. Received 3rd March 2022, Accepted 13th May 2022. The authors gratefully acknowledge support from the NSF CSDM-A program (Grant CHE-1665467) and the NASA Laboratory Astrophysics program (Grant NNX-16AC75G). SED is supported by the National Science Foundation Graduate Research Fellowship Program under Grant no. DGE-1745301. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. There are no conflicts to declare.

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