Role of photochemical processes in the use of laser-induced fluorescence at 230.1 nm for the diagnostics of hydrocarbon flames

It is shown experimentally that the action of radiation at a wavelength of 230.1 nm causes photodissociation of vibrationally excited molecules of car bon dioxide. For a radiation intensity exceeding 1.3 GW/cm(2), the photodis sociation process is saturated. In a range of gas temperatures from 1300 to 2000 K, the temperature dependence of the degree of photodissociation was determined, which correlates well with the temperature dependence of the cr oss section for absorption of carbon dioxide molecules known from the liter ature.