Science and Technology Facilities Council
Helmholtz-Zentrum Berlin für Materialien und Energie
The Photon and Neutron Experimental Techniques Ontology
Photon and Neutron Experimental Techniques: An ontology of techniques within the photon and neutron (PaN) domain. Purpose The main purpose of this ontology is to provide a controlled vocabulary, global PIDs and annotations for photon and neutron techniques, to support PaN FAIR data catalogue functionality. Design philosophy In the original version of the ontology, everything is a class and all classes are techniques. Object property relations are implied but not formalized in this version. Subclass/superclass relationships and intersections are used to define specific technique classes in terms of broader superclasses. This is seen as a key requirement in order to carry out catalogue searcher for broader concepts, for example. The ontology has since been restrucred to include both technique classes and specifier classes. The relationships between the two are also made explicit and formalized in the form of Object Properties. The specifier classes were created by identifying technique classes that act as umbrella terms. These techniques are defined using object properties and specifiers. The rest are defined in terms of other techniques using a mix of subclass and equivalence axioms. This project was undertaken under ExPaNDS WP3.2 (https://expands.eu/) The ontology is can be found here: https://github.com/ExPaNDS-eu/ExPaNDS-experimental-techniques-ontology The restructuring of the ontology is detailed in a paper: https://doi.org/10.1107/S1600577525005272 Photon and neutron PaN ontologies developed under ExPaNDS are documented here: https://doi.org/10.5281/zenodo.4806026
photon and neutron technique relationships
A technique in the domain of neutron, muon and accelerator-based light sources
A technique defined by its experimental probe type
A technique defined by a physical process
defined by experimental physical process
A technique defined by its functional dependence
A technique defined by its goal or purpose
A technique for which a pulsed probe is essential
Any phenomenon where a particle of the same type as the probe is emitted
Independent of probe; classed also as scattering if the probe and emitted particles are of the same type; disjoint with elastic scattering
obtain electronic ground state properties
Energy is between hard and soft x-ray, e.g. sulphur K edge
Probe is highly coherent over illuminated sample
atomic scale diffraction 3D volume 3D periodic
atomic scale diffraction 2D surface or film
low surface momentum transfer scattering
high momentum transfer resolution scattering
high energy resolution emission technique
obtain electronic density of occupied states
obtain electronic density of unoccupied states
Angle resolved photoemission spectroscopy
angle resolved photoemission spectroscopy
Any technique that depends essentially on probe polarization
grazing incidence small angle scattering
high resolution photoelectron spectroscopy
quasielastic neutron spin echo scattering
spin echo resolved grazing incidence scattering
UV and visible circular dichroism spectroscopy
absorption and phase contrast nanotomography
grazing incidence small angle x-ray scattering
high pressure single crystal diffraction
extended x-ray absorption fine structure
spin resolved photoelectron spectroscopy
propagation phase contrast microtomography
ambient pressure x-ray photoelectron spectroscopy
spin and angle resolved photoemission spectroscopy
high resolution neutron powder diffraction
high resolution thermal neutron powder diffraction
thermal neutron single crystal diffraction
inelastic neutron scattering spectroscopy
grazing incidence small angle neutron scattering
time of flight small angle neutron scattering
micro small angle x-ray scattering tomography
micro grazing incidence small angle x-ray scattering tomography
scanning angle resolved photoemission spectromicroscopy
nano angle resolved photoemission spectroscopy
high resolution core-level photoemission spectroscopy
high resolution x-ray photoelectron spectroscopy
high resolution inelastic neutron scattering
microfocus macromolecular crystallography
nanofocus macromolecular crystallography
time resolved serial femtosecond crystallography
fixed target serial synchrotron crystallography
lipidic cubic phase serial synchrotron crystallography
time resolved serial synchrotron crystallography
grazing incidence wide angle x-ray scattering
high resolution angle resolved photoemission spectroscopy
atomic force microscope infrared spectroscopy
energy dispersive extended x-ray absorption fine structure
microfocus x-ray absorption spectroscopy
X-ray microscopy that operates on time scales less than one microsecond with femtosecond illumination
x-ray propagation phase contrast tomography
x-ray propagation phase contrast microtomography
Types of experimental physical processes