Investigation of the photolysis of the surface-adsorbed HNO3 by combining laser photolysis with Brewster angle cavity ring-down spectroscopy

► We have investigated the 308 and 351 nm photolysis of HNO3 adsorbed on fused silica surfaces. ► We probe excited NO2 product retained on surface with Brewster angle cavity ring-down spectroscopy. ► The capability of the technique in the study of surface photochemistry has been demonstrated.