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Vacuum-ultraviolet absorption linewidth measurement using high-order anti-Stokes Raman-shifted radiation

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Abstract

We assess the suitability of a tunable, coherent source of VUV radiation, based on stimulated Raman scattering in compressed H2, for quantitative high-resolution spectroscopy. The ~360-nm output of an excimer-pumped dye laser was used as a pump source. The high-order anti-Stokes components (AS6–AS9, ~150–~190 nm) show a power-dependent bandwidth, a FWHM of ~0.15 cm−1 being attainable at low pump power. Measurements of predissociation linewidth for rotational lines from the (17–0) Schumann–Runge band of 16O2 were made by using the seventh anti-Stokes component of the source. These are currently the most accurate measurements available and are in good agreement with theoretical predictions.

© 1989 Optical Society of America

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