Adsorption of water vapour on to solid surfaces can cause measurement anomalies in a number of applications. In the particular case of interference gas refractometry this produces a reduction in the humidity of the moist gas contained within the sample cell, leading to errors in the measurement of the refractive index. A technique is described for investigating these anomalies for a variety of material surfaces, and results from fused silica and stainless steel are discussed.
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Birch et al. (1988) studied this question.
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