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The density of 0.5-3 m thick vapor-deposited films of water ice were measured by combined optical interferometry and microbalance techniques during deposition on an optically flat gold substrate from a capillary array gas source. The films were of high optical quality with an index of refraction of 1.29Ϯ0.01 at 435.8 nm, a density of 0.82Ϯ0.01 g/cm 3 , and a porosity of 0.13Ϯ0.01. In contrast to previous studies, none of the measured properties exhibited any significant variation with growth rate or temperature over the range studied ͑0.6-2 nm/min, 20-140 K͒.

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