Molecular beam-thermal hydrogen desorption from palladium

Lobo, R. F. M.; Berardo, F. M. V.; Ribeiro, J. H. F.
April 2010
Review of Scientific Instruments;Apr2010, Vol. 81 Issue 4, p043103
Academic Journal
Among the most efficient techniques for hydrogen desorption monitoring, thermal desorption mass spectrometry is a very sensitive one, but in certain cases can give rise to uptake misleading results due to residual hydrogen partial pressure background variations. In this work one develops a novel thermal desorption variant based on the effusive molecular beam technique that represents a significant improvement in the accurate determination of hydrogen mass absorbed on a solid sample. The enhancement in the signal-to-noise ratio for trace hydrogen is on the order of 20%, and no previous calibration with a chemical standard is required. The kinetic information obtained from the hydrogen desorption mass spectra (at a constant heating rate of 1 °C/min) accounts for the consistency of the technique.


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