SPECTRAL AND TEMPERATURE DEPENDENCES OF THE QUANTUM YIELD OF THE PHOTOADSORPTION OF SIMPLE GASES ON DISPERSED ZINC-OXIDE

The dependence of the quantum yield of oxygen and methane photoadsorpt ion on the energy of incident photons (1.7 - 4.9 eV) and the temperatu re (100 - 700 K) was investigated further with the use of a manometric technique and a sample of ZnO possessing the properties of the black body, in the interior of which exciting light was introduced. A band o f photoadsorption activity with respect to O-2 and CH4 with a maximum at 3.25 eV was first observed, and the dependence K-0(T) was found for methane. As the temperature decreases, K-0 increases for both,eases, and this dependence has a stepwise character up to 150 K for O-2 and 2 50 K for CH4. As the temperature decreases further, the corresponding K-0 value drops sharply.