title: Molecular beam-thermal hydrogen desorption from palladium.
abstract: 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 degrees C/min) accounts for the consistency of the technique.
authors.affiliation: Grupo de Nanotecnologia e Ciência à Nano-Escala, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal. rfl@fct.unl.pt
authors.forename: R F M
authors.initials: RF
authors.lastname: Lobo
authors.forename: F M V
authors.initials: FM
authors.lastname: Berardo
authors.forename: J H F
authors.initials: JH
authors.lastname: Ribeiro