Schematic drawing of the porous amorphous ice grown on top of a NO layer deposited on a gold surface. The outer surface (in green) is the surface directly accessible from the gas phase (with a normal incidence). The inner surface (in blue) is the surface accessible via surface diffusion. Bulk diffusion is required to access closed pores (dark blue). The reactive layer can be accessed via surface diffusion (both inner and outer surfaces) along the cracks or pores. This case is represented in light red. Part of the reactive layer that required bulk diffusion is drawn in dark red.
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