Irradiation effects of excimer laser light on poly(vinylidene fluoride) (PVdF) film

The irradiation effects of intense ultraviolet (UV) light from ArF and KrF excimer lasers on poly(vinylidene fluoride) (PVdF) were studied. The optica l absorption spectroscopy made it clear that irradiation with ArF and KrF e xcimer laser light mainly caused the formation of diene and triene structur es, respectively. From the dependence on the laser intensity it was found t hat ArF and KrF laser-induced reactions proceeded via single-photon and mul ti-photon processes, respectively. The wavelength dependence was explained by photochemical and photothermal effects of ArF and KrF excimer lasers, re spectively. These results indicate that the distinction of the photo-reacti on between the two is closely related to the difference in the absorption s ites.