Abstract

A simple modification of a conventional excitation unit for the Raman effect is described that allows study of the effect in liquids at temperatures down to about −150°C. The chief feature of the arrangement is a Dewar-jacketed sleeve that fits around the Raman tube and enables the cooling of the tube by a flow of cold nitrogen gas. By adjustment of the temperature of the gas and its rate of flow, easy and precise control of the temperature of the Raman tube can be obtained. It is also possible to use elevated temperatures (up to +150°C) by heating the nitrogen. The advantages of the system are its simplicity, ease of operation, rapidity of change from low temperature to normal operation, and vice-versa, and the same intensity of illumination as that afforded by room-temperature operation.

© 1950 Optical Society of America

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References

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  1. Compare the summaries in the monographs of Kohlrausch. See also Glockler and Renfrew, Rev. Sci. Inst. 9, 306 (1938).
    [Crossref]

1938 (1)

Compare the summaries in the monographs of Kohlrausch. See also Glockler and Renfrew, Rev. Sci. Inst. 9, 306 (1938).
[Crossref]

Glockler,

Compare the summaries in the monographs of Kohlrausch. See also Glockler and Renfrew, Rev. Sci. Inst. 9, 306 (1938).
[Crossref]

Renfrew,

Compare the summaries in the monographs of Kohlrausch. See also Glockler and Renfrew, Rev. Sci. Inst. 9, 306 (1938).
[Crossref]

Rev. Sci. Inst. (1)

Compare the summaries in the monographs of Kohlrausch. See also Glockler and Renfrew, Rev. Sci. Inst. 9, 306 (1938).
[Crossref]

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Figures (3)

Fig. 1
Fig. 1

Excitation unit for the Raman effect. (Reproduced from Practical Spectroscopy by courtesy of Prentice-Hall, Inc.)

Fig. 2
Fig. 2

Cross section of Raman illuminator showing the refrigeration system. The outside diameter of the vacuum-jacketed transfer tube is about 40 mm. The separation of the top and bottom plates of the filter cylinders is 10 cm.

Fig. 3
Fig. 3

Metal heat-interchanger and trap for refrigeration and drying of nitrogen gas.