The nitrate free radical was photolyzed by a pulsed tunable dye laser between 470 and 685 nm, at 296 K, and in the presence of 10 torr N2. The two product channels, NO+O2 and NO2+O, were measured by resonance fluorescence of NO or of O. Absolute calibration of the method was achieved by in situ ultraviolet photolysis of NO2, which yields both NO and O. With these data on photochemical yields, the photolysis coefficients for the two product channels at the surface of the earth with an overhead sun over wavelengths 470--700 nm are calculated to be j1(NO+O2)=0.022¿0.007 s-1 j2(NO2+O)=0.18¿0.06 s-1.