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Adsorption in Gas Mass Spectrometry. II. Effects on the Measurement of Isotope Amount Ratios.

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The effects of adsorption in the mass spectrometer inlet system on the measured isotope amount ratios are discussed. A model is proposed to correct for these effects. The values of the isotope amount ratios obtained with the help of the model are about 1x10(exp-5) lower than the values obtained by linear extrapolation. The model enables to estimate the isotope fractionation factors involved in the effusion, adsorption and desorption processes.
1997-05-28
JRC14861
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