Deuterium-hydrogen ratio spectrometric determn. - uses specimen enclosed in tube and cooled down to temp. safeguarding preset vapour pressure over specimen

摘要

The process is used for emission spectrometric determination of the deuterium-hydrogen ratio in marked water samples. The spectral lines of the water vapour components are produced by a high frequency induced gas discharge, while the triggering of the isotope spectral lines is carried out by a Fabry-Perot interferometer and the spectral line intensity is recorded. The sample is enclosed in a tube and cooled down to a temp., at which a presettable vapour pressure is produced over the sample. The excitation of the gas discharge is carried out with a low power, and the selection of a narrow spectral range about the H alpha-D alpha line is carried out. The interferometer separates two rings, geometrically corresponding to both lines, the intensity of both lines being measured by photodetectors and evaluated. Pref. the sample is frozen in a gas tube, which is sealed and cooled down again. The vapours are energised by a high frequency resonator.