HIGH RESOLUTION INFRARED DOUBLE RESONANCE SPECTROSCOPY IN A FREE JET
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Date
1992
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Ohio State University
Abstract
Infrared beams from two color center lasers are crossed in a free jet to produce state-selected spectra of propyne in the $6500 cm^{-1}$ region. The jet is surrounded by a resonant Fabry-Perot etalon which is used to enhance the intensity of the pump laser beam. The probe beam is multipassed through a small interaction volume to maximize the absorption signal. With the pump laser tuned to a line in the propyne $v_{1}$ fundamental band, the probe laser is scanned through the $2v_{1}\leftarrow v_{1}$ region. When the laser crossing is 1 to 2 cm from a 0.15 mm diameter nozzle, the resolution is about 20 MHz FWHM. The spectra are of similar quality to the single resonance optothermal spectra supplied to us in advance of publication by McIlroy, Nesbitt, Kerstel, Pate, Lehmann, and Scoles. With the aid of state selection, additional peaks have been identified and assigned.
Description
Author Institution: Department of Chemistry, The University of Akron