SPECTROSCOPY OF THE GROUND, FIRST AND SECOND EXCITED TORSIONAL STATES OF ACETALDEHYDE FROM 0.05 TO 1.6 THz.
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Date
2013
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
A new global study of the acetaldehyde (CH${_3}$CHO) spectrum is reported. The new measurements cover the frequency range from 49 GHz to 1.6 THz and have been carried out using three different spectrometers in IRA NASU (Ukraine), PhLAM Lille (France), and JPL (USA). The rotational transitions belonging to the three lowest torsional states, as well as previously published data on the FIR torsional bands, of the molecule have been analyzed using the rho-axis-method. The dataset consisting of more than 19700 line frequencies and including rotational transitions with {\it J} up to 66 and {\it K${_a}$} up to 22 was fit using a model consisting of 117 parameters and weighted root-mean-square deviation of 0.71 has been achieved. Details of this new study and problems encountered in analysis of the second torsional state will be discussed.
Description
Author Institution: Institute of Radio Astronomy of NASU, Chervonopraporna 4, 61002 Kharkov, Ukraine; Laboratoire de Physique des Lasers, Atomes et Molecules, UMR 8523 CNRS-Universite Lille 1, Batiment P5, F-59655 Villeneuve d'Ascq Cedex, France; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099, USA