# DETECTION OF VAN DER WAALS VIBRATIONAL TRANSITIONS USING A NEW MW-THz DOUBLE RESONANCE TECHNIQUE

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 Title: DETECTION OF VAN DER WAALS VIBRATIONAL TRANSITIONS USING A NEW MW-THz DOUBLE RESONANCE TECHNIQUE Creators: Markov, Vladimir N.; Xu, Yunjie; Jäger, Wolfgang Issue Date: 1998 Publisher: Ohio State University Abstract: A new double resonance technique has been developed that can be used for the detection of low frequency van der Waals vibrations. The technique uses backward wave oscillators (OB-24, OB-30, ISTOK), which are phase-locked to a KVARZ mm-wave synthesizer (78-118 GHz), as pump $sources,^{b}$ and a pulsed jet cavity Fourier transform microwave spectrometer for detection. Initial measurements were done on the Ar-CO $system^{c}$ for which the THz frequencies of ro-vibrational transitions from the ground to the first excited van der Waals bending state were known from previous $measurements.^{d}$ Resolving power and sensitivity of the technique will be discussed. Description: $^{a}$permanent address: Institute of Applied Physics of the Russian Academy of Sciences, Ulyanova St. 46, 603600 Nizhnii Novgorod Russia. $^{b}$ G. Winnewisser. A.F. Krupnov, M. Yu. Trctyakov, M. Liedtke. F. Lewen, A.H. Salek, R. Schieder, A.P. Shkaev, and S.V. Volokhov, J. Mol. Spectrosc. 165, 294 (1994). $^{c}$ Y. Xu and A.R.W. McKellar, Mol. Phys. 88, 859 (1996). $^{d}$ M. Hepp. R. Gendriesch, I. Pak, F. Lewen, and G. Winnewisser. J. Mol. Spectrosc. 183, 295 (1997). Author Institution: Department of Chemistry, University of Alberta URI: http://hdl.handle.net/1811/18910 Other Identifiers: 1998-RE-09