Abstract
Abstract Water ices used as mimics in laboratory studies of heterogeneous chemical reactions have been investigated by FTIR. Water ice as vacuum deposited onto a CsI substrate at 5 K was found to be essentially non-porous. Inert gas pre-deposition and co-deposition followed by temperature cycling induced surface and bulk porosity into the produced layers. Porosity was monitored by the shape and position of the 3300 cm−1 coupled water band, by the dangling OH high frequency mode, and by the modes of hydrogen bonded and trapped CO. The highest amount of dangling OH bonds was revealed with Ar/H2O deposition mixtures whereas the highest degree of bulk porosity was achieved with neon as co-deposited gas.
Published Version
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