A MULTIPLE REFLECTION CELL TO ENHANCE DIRECT IR ABSORPTION IN A COLLIMATED MOLECULAR BEAM

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1986

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Ohio State University

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Direct absorption measurements using an F-center laser are carried out in a collimated molecular beam. Absorbance is increased by passing the laser beam up to 80 times through the molecular beam. The multiple reflection cell consists of two spherical concave mirrors in a near concentric alignment. The laser beam, directed slightly off-axis into the cell, forms a parabolic spot pattern on each mirror. The laser beam reflections collectively form a waist at the center of the cell. The dimension of the waist and the number of reflections can be adjusted independently, enabling efficient coupling to a collimated molecular beam. High resolution sub-Doppler spectra of methyl acetylene with a line width of 35 MHz have been obtained in the 3 micron region.

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Address: Department of Chemistry, University of Rochester, Rochester, NY 14627
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http://hdl.handle.net/1811/16912

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1980-1989