Ultraviolet absorption spectrum of methylhydroperoxide vapor

The ultraviolet absorption cross sections of methylhydroperoxide, CH3OOH, have been measured over the wavelength range 210 nm to 350 nm at 294 K. We conclude that solar photolysis is a dominant sink for tropospheric CH3OOH. For midlatitudes the photodissociation rate is estimated to be ∼4.3 × 10−6 s−1 for 0°, 3.7 × 10−6 s−1 for 30°, and 1.0 × 10−6 s−1 for 70° zenith angle.