Summary Neutrons for the analysis of hydrogen in solids Recent advancement of renewable energy applications lead to increased focus in materials and surface science on hydrogen technologies. Neutron‐based analytical methods are wellsuited to detect structural sites and dynamics of hydrogen in solids. Because of its large incoherent scattering cross‐section, very small quantities of hydrogen are detectable. This article gives an overview over fundamental aspects of neutron methods and discusses some selected examples of analysis techniques. Results of structural investigations, for kinetics observed by quasielastic scattering as well as decomposition mechanisms investigated by non‐elastic scattering are shown for alanates, as important materials for hydrogen storage. Furthermore, small angle diffraction studies of the mesoscopic structure of polymer membranes and of electrodes for fuel cells are presented. Finally, observations of geometric changes in thin metal oxide layers due to incorporation of hydrogen by neutron reflectometry are described.
Summary Ion beams for analysis of hydrogen in solids Hydrogen is an important carrier of energy and, in the context of the growing request for renewable energy sources, a candidate for energy storage. Scientific questions relating to the study of the hydrogen of materials arise, on the one hand, from the interaction of hydrogen with the surrounding solid state material and, on the other hand, from the use of solids as a direct storage medium. Ion beam methods have proved suitable for this purpose. The methods secondary ion mass spectrometry (SIMS), elastic recoil detection analysis (ERD) and nuclear reaction analysis (NRA) are portrayed. Examples illustrate the techniques, applications for depth analysis are described and the sensitivity of the methods is given.
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