Abstract
An analysis is presented of the errors in the complex refractive index spectrum of liquids in the far i.r. spectral region (∼ 5–500 cm −1) as determined by free layer experiments. The specimen transmission method, most popular in present practice, is found to be the most reliable one if editing methods can be applied. It is further concluded that the repeating of single measurements in order to minimize random errors is not necessary in practice, but that experiments at several specimen thicknesses are obligatory. It is shown that the error due to the vapour above the liquid specimen can be quite substantial.
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