SLICED-JET SPECTROSCOPY - A NEW TECHNIQUE FOR SUB-DOPPLER INFRARED SPECTROSCOPY OF SUPER-COOLED MOLECULES
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Date
1989
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Direct absorption spectroscopy in a conventional free jet yields Doppler-broadened linewidths comparable to a room temperature gas (300-600 MHz in the 3 micron region). A new sub-Doppler technique called ``sliced-jet spectroscopy'' in reported here. A razor blade is placed in the jet between the nozzle and the laser crossing to obstruct those molecules with zero Doppler shift and thereby creating a narrow hole in the center of the Doppler profile. The resultant lineshapes resemble those obtained by saturation spectroscopy except that the hole-burning mechanism is mechanical. The best resolution obtained to date is 12 MHz (FWHM of the hole) which is in agreement with the theoretical resolution that determined by the optical properties of the system. The technique has been applied to acetylene, 1-butyne, and 3,3-dideutero-1-butyne.
Description
Author Institution: Department of chemistry, The University of Akron