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D. C. ROBIE, N. SEISER, Department of Chemistry, Barnard College, New York, NY 10027.
We have used cavity ring-down spectroscopy to measure pressure-broadening coefficients for several rotational lines in the atmospheric B band of O2 at 688 nm. Collisional partners of the O2 include O2, N2, and Ar. Total pressures range up to 2 atm; at that pressure, the self-broadened linewidth is 0.3 cm-1, about twice the laser bandwidth. Comparisons with previous measurements by other techniques will be discussed.