dc.creator Sandholm, S. T. en_US dc.creator Shabestary, N. en_US dc.creator Schwendeman, R. H. en_US dc.date.accessioned 2006-06-15T14:50:22Z dc.date.available 2006-06-15T14:50:22Z dc.date.issued 1983 en_US dc.identifier 1983-TE-03 en_US dc.identifier.uri http://hdl.handle.net/1811/11974 dc.description Author Institution: Department of Chemistry, Michigan State University East Lansing en_US dc.description.abstract A computer-coupled infrared-microwave two-photon spectrometer has been used to record the lineshapes of transitions in $^{15}NH_{3}$ as a function of sample pressure and microwave power. The frequency of the $CO_{2}$ laser is stabilized by monitoring the saturation dip in the fluorescence from a $CO_{2}$ sample in the laser cavity. A laboratory computer steps the microwave frequency and records the spectrum. The computer also records the frequency variation of the microwave power, which can be used to normalize the data to constant power. The lineshapes, as analyzed by means of the expression for a Voigt profile, appear to show significant changes in the center frequency and the Lorentz width as the microwave power is varied. The nature of these variations will be described and compared to predictions from the theory of two-photon absorption in a three-level system. $^{*}$This work was supported by the National Science Foundation en_US dc.format.extent 74090 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE LINESHAPE OF INFRARED-MICROWAVE TWO-PHOTON TRANSITIONS: THE $\nu_{2}$ BAND OF $^{15}NH_{3}\ast$ en_US dc.type article en_US
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