FAR INFRARED SPECTROSCOPY OF MALONALDEHYDE
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Date
1990
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Publisher
Ohio State University
Abstract
A tunable far infrared difference frequency spectrometer has been used to examine the fully protonated form of malonaldhyde in the region near the ground state tunneling spectrum $(21 cm^{-1})$. We find an extremely dense and complex spectrum in which the strongest features have been assigned as pure rotational lines involving high values of J and $K_{-1}$. These transitions, which have been observed within the rotational manifolds of both the lower and upper halves of the tunneling doublet, have been fit simultaneously with existing microwave $data^{(1)}$ for this species. The resulting set of spectroscopic constants significantly extends the range of rotational states that may be accurately calculated and should therefore be valuable in assigning the rotation-tunneling spectrum. The origins of the high spectral density will be discussed.
Description
$^{(1)}$ P.Turner, S.L. Baughcum, S.L. Coy, and S. Smith, J. Amer. Chem. Soc., 106, 2265 (1984)
Author Institution: Department of Chemistry, University of Minnesota; Department of Chemistry, Massachusetts Institute of Technology
Author Institution: Department of Chemistry, University of Minnesota; Department of Chemistry, Massachusetts Institute of Technology