A method for forming a thin-film transistor gate insulating layer over a substrate disposed in a processing chamber is provided. Sorbent materials of this invention comprise oxy- or hydroxyl-halogen of manganese, copper and calcium as the active phase for Hg0 oxidation, and are dispersed on a high surface porous supports. A beam positioner receiving commands from a programmed controller causes a UV laser beam of a wavelength that is within the light absorption wavelength range to cut into the mask multiple slots with repeatable, precise dimensions. The organic acid may also have other residual benefits, such as removing any metallic impurities from the surface of the anode.