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首页> 美国政府科技报告 >Tunable far infrared laser spectroscopy of Van der Waals molecules in a planar supersonic jet expansion
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Tunable far infrared laser spectroscopy of Van der Waals molecules in a planar supersonic jet expansion

机译：可调谐远红外激光光谱法中的范德华分子在平面超音速射流膨胀中

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The gas phase high resolution spectroscopic study of weakly bound clusters can provide the information necessary to develop an intermolecular potential energy surface. This surface can then be used to better understand condensed phases. In this work, a tunable far infrared laser spectrometer is used to study weakly bound dimers produced in the newly developed continuous planar supersonic jet expansion apparatus. The water dimer is an extensively studied hydrogen bonded dimer. It undergoes several tunneling motions which result in splittings and perturbations of the rovibrational energy levels. A review is presented of much of the experimental and theoretical work done on water dimer, including a description of the combined fit of all the high resolution spectroscopic results by Coudert and Hougen. Also included is a discussion of the measurement of the K = 1 lower (yields) K = 2 lower band performed using the tunable far infrared laser/planar jet apparatus. The preliminary results from the study of CH(sub 4)(center dot)H(sub 2)O will also be presented. CH(sub 4)(center dot)H(sub 2)O is unique in that unlike a strongly anisotropic complex, such as the water dimer, the monomer subunits are nearly free internal rotors. Seven bands are observed which have very similar band origins and rotational constants. Two energy level diagrams are proposed which are strongly influenced by earlier ArH(sub 2)O studies. A brief qualitative discussion of the CH(sub 4)(center dot)H(sub 2)O binding energy compared to that of ArH(sub 2)O is also included. 152 refs., 54 figs., 20 tabs.

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