ROTATIONAL SPECTROSCOPY OF ETHYLAMINE INTO THE THz
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Date
2009
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Ethylamine is one of the molecules that exhibits a challenging combination of two low frequency motions: inversion and internal rotation. The separation between these modes is fortunately appreciably greater than in the lighter methylamine, and the cm-wave rotational spectra of {\it anti}-ethylamine, {\bf 91}, 116-127 (1982).} and $gauche$-ethylamine, {\bf 104}, 226-247 (1984).} have been assigned some time ago. Recent astrophysical interest prompted laboratory investigation of $anti$-ethylamine up to 270 GHz and an associated astronomical search for this species in Sgr B2(N)., {\bf 673}, 1240-1248 (2008).} \vspace{0.2cm} We report extensive new coverage of the rotational spectrum of ethylamine obtained in the form of three broadband segments, each recorded by using a different instrumental technique. The spectrum in the 115-376 GHz region was obtained with the FASSST spectrometer,, {\bf 228}, 314-328 (2004).} at 555-650 GHz by using cascaded harmonic multiplication from a cm-wave synthesizer, and at 867-1081 GHz by also using FASSST, but with frequency tripled output from a 300 GHz-region BWO oscillator. The spectrum is at an advanced stage of analysis, carried out by means of the graphical assignment AABS package,, {\bf 233}, 231-243 (2005).} and results obtained for both $anti$- and $gauche$-ethylamine are presented.
Description
E.Fischer, E.Botskor, {\it J.~Mol.~Spectrosc.E,Fischer, E.Botskor, {\it J.~Mol.~Spectrosc.A.J.Apponi, et al., {\it Astrophys.~J.I.Medvedev et al., {\it J.~Mol.~Spectrosc.Z.Kisiel et al., {\it J.~Mol.~Spectrosc.
Author Institution: Institute of Physics, Polish Academy of Sciences, Al. Lotnikow; 32/46, 02-668 Warszawa, Poland; Department of Physics, The Ohio State University, Columbus; OH 43210; I. Physikalisches Institut, Universitat zu Koln; Zulpicher Str. 77, 50937 Koln, Germany
Author Institution: Institute of Physics, Polish Academy of Sciences, Al. Lotnikow; 32/46, 02-668 Warszawa, Poland; Department of Physics, The Ohio State University, Columbus; OH 43210; I. Physikalisches Institut, Universitat zu Koln; Zulpicher Str. 77, 50937 Koln, Germany