Publications by authors named "Ad A van Well"
Article Synopsis
- - The neutron reflectometer at Delft University of Technology has been upgraded and relocated, enabling research on various interfaces like air/liquid and solid/air.
- - Key improvements include a new flexible double disk chopper system for better wavelength resolution, a movable diaphragm for controlling beam size, and guides along the neutron flight path to enhance intensity.
- - The upgraded reflectometer's capabilities are demonstrated through measurements on hydrogen sensing materials, showcasing its enhanced performance.
Article Synopsis
- Nanostructured metal hydrides are effective in hydrogen detection using optical sensors, with two main systems: thin films and nanoparticle arrays.
- A study comparing PdAu alloys indicates that the optical responses of these systems to hydrogen are fundamentally different due to distinct structural responses, not just varying optical readout methods.
- The findings highlight that the interaction between the film and substrate significantly influences hydrogen solubility and metal-hydride transitions, underscoring the importance of nanostructuring in the performance of optical hydrogen sensors and plasmonic devices.
The Goos-Hänchen effect is a spatial shift along an interface resulting from an interference effect that occurs for total internal reflection. This phenomenon was suggested by Sir Isaac Newton, but it was not until 1947 that the effect was experimentally observed by Goos and Hänchen. We provide the first direct, absolute, experimental determination of the Goos-Hänchen shift for a particle experiencing a potential well as required by quantum mechanics: namely, wave-particle duality.
View Article and Find Full Text PDFIntercalation of Li in TiO2 anatase results in a phase separation in a Li-poor and a Li-rich phase. The local lithium configuration in the coexisting crystallographic phases is resolved by detailed analysis of neutron diffraction data. In each of the phases, two distinct positions within the octahedral interstices are found, with a temperature-dependent occupancy.
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