VERY HIGH RESOLUTION INFRARED SPECTROSCOPY OF MOLECULAR BEAMS WITH COLOR CENTRE LASERS
Loading...
Date
1980
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
We have $demonstrated^{(1)(2)}$ that the infrared spectra of molecules in a molecular beam may be observed by crossing the molecular beam orthogonally with the output of a tunable infrared diode laser and detecting bolometrically the increase in molecular energy that accompanies excitation of vibrational-rotational transitions. Because the molecular and laser beams are highly collimated and cross orthogonally, the resulting spectrum has a resolution below the limit imposed by the Doppler broadening characteristic of gas phase spectra. Since these $report^{(1)(2)}$ we have replaced the diode laser with a Color Centre Laser (Burleigh FCL-20) pumped by a krypton ion laser (Spectra Physics 171). The observed molecular beam linewidth with no active stabilization of the laser is 1.5 MHz, to be compared with a room temperature Doppler width of approximately 300 MHz. Stark spectra of the 1-0 fundamental transition of hydrogen fluoride have been obtained giving an accurate measure of fundamental transition of hydrogen fluoride have been obtained giving an accurate measure of the dipole moment in the first vibrational excited state. ($\mu_{v=1}=1.872\pm 0.003$ D). Application of this technique to several other molecules will also be discussed.
Description
$^{1}$T.E. Gough, R.E. Miller and G. Scoles, App. Phys. Letters 30, 338 (1977). $^{2}$T.E. Gough, R.E. Miller and G. Scoles, J. Mol. Spec. 72, 124 (1978).
Author Institution:
Author Institution: