FAST-SCAN, PULSED-JET SUBMILLIMETER WAVE ABSORPTION SPECTROSCOPY

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Title: FAST-SCAN, PULSED-JET SUBMILLIMETER WAVE ABSORPTION SPECTROSCOPY
Creators: Melnik, Dmitry G.; Gopalakrishnan, Sandhya; Miller, Terry A.; De Lucia, Frank C.
Issue Date: 1999
Publisher: Ohio State University
Abstract: A newly developed pulsed jet spectrometer utilizing an extension of the previously reported FASSST $technique^{a}$ is discussed. The output beam from a backward wave oscillator (BWO) is focused on a pulsed supersonic jet and rapidly scanned in frequency (up to $10^{5}$ Doppler linewidths per second), covering the entire accessible spectrum range. The absolute frequency calibration and system synchronization is performed in real time by linking the output signal to a computer running appropriate software. The sensitivity of the apparatus is such that $^{13}C^{18}O$ can be seen in natural abundance with modest integration time. The apparatus is optimized for searching for weak molecular lines. The method and apparatus has been developed for use in the spectroscopy of low lying vibrational modes corresponding to conformational, torsional, and psecudorotational motion of non-rigid molecules, including Van der Waals clusters. Initial experiments have involved complexes of the CO molecule. These and related results will be discussed.
Description: $^{a}$ Petkie D.T.; Goyette T.M.; Bettens R.P.A; Belov S.P.; Albert S.; Helminger P; and Dc Lucia F.C., Rev. Sci. Instrum., 1997, 68(4), 1675
Author Institution: The Ohio State University, Dept. of Chemistry, Laser Spectroscopy Facility; The Ohio State University, Department of Physics
URI: http://hdl.handle.net/1811/19367
Other Identifiers: 1999-RG-05
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