Abstract

A very thin ring produced by evaporating aluminium in high vacuum on one of the two very exactly plane polished quartz plates forming the absorption cell is used as distance ring. The plate rotates in the vacuum during evaporation to obtain regular distribution of the metal. Plate distances down to 0.34μ were obtained. Small distances of this size can be measured with high precision by measuring interference fringes appearing in the spectrum due to the reflexions by the inner cell walls. The possible errors both experimental and technical are discussed and quantitative relations are given.

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