Relative values of the quantum yield of O(1D2) from the photolysis of ozone in the wavelength region 275--325 nm have been measured by observing infrared fluorescence following the reaction O(1D2)1CO2→O(3PJ)+CO2(mnp), indicating multiply vibrationally excited CO2 with m quanta in the symmetric mode v1, n in the (doubly degenerate) bend v2, and p in the asymmetric stretch v), using the frequency-doubled output of a narrow-band dye laser as the photolysis source. The location and shape of the falloff in O(1D2) yield near 310 nm confirms the results of previous studies made with other means of quantifying O(1D2). A tail in the quantum yield at longer wavelengths, not consistently observed in other experiments, is clearly evident here. The quantum yield also appears to decrease slowly at wavelengths shorter than about 290 nm. ¿ American Geophysical Union 1988