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Glass capillary columns either with modified internal area or coated with a layer of liquid phase exhibit a very high resolution and may be used to separate isotopic molecules. Optimum working conditions have been established in terms of peak resolution and analysis time.The following systems have been studied by operating at temperatures up to 77°K.: CH4-CD4, CH-CDe, C2H4-C2D4, CtHs-CyDg, and 0216-0218. The gas chro-

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