A NEW TECHNIQUE FOR ULTRA LONG PATH, HIGH RESOLUTION MOLECULAR SPECTROSCOPY
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Publisher:Ohio State University
High resolution infrared and visible spectra of very weak vibration-rotation bands are difficult to obtain at suitably low pressures because of the very long absorption paths required. Such spectra are essential to an understanding of, for example, high order overtone and combination bands of polyatomic molecules. Furthermore, the analysis of molecular spectra of terrestrial and planetary atmospheres depends on the availability of suitable laboratory spectra. A technique has been developed for obtaining ultra long paths for absorption spectroscopy. The method involves trapping a short laser pulse between two widely separated retro-reflectors. This pulse is released after traversing the required number of reflections. A total path of 20 km has been achieved in a 1 km long cell, and longer path lengths are feasible with this technique. Applications to measurements of high resolution laboratory spectra of gases will be discussed. This research was supported by the National Science Foundation, Grants GA-30713 and GA-30714. Permanent address of R. Goldstein: Jet Propulsion Laboratory, Pasadena, California.
Author Institution: Geophysics Program, University of Washington Seattle; Earth Resources and Astrophysics Laboratory, Department of Physics and Astronomy; Geophysics Program, University of Washington Seattle
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