3.3.3.15. NXelectronanalyser¶
Status:
base class, extends NXobject
Description:
Subclass of NXinstrument to describe a photoelectron analyser.
Symbols:
The symbols used in the schema to specify e.g. dimensions of arrays
nfa: Number of fast axes (axes acquired symultaneously, without scanning a pysical quantity)
nsa: Number of slow axes (axes acquired scanning a pysical quantity)
- Groups cited:
NXcollectioncolumn, NXdeflector, NXdetector, NXenergydispersion, NXlens_em, NXspindispersion, NXtransformations
Structure:
description: (optional) NX_CHAR
Free text description of the type of the detector
name: (optional) NX_CHAR
energy_resolution: (optional) NX_FLOAT {units=NX_ENERGY}
Energy resolution of the electron analyser (FWHM of gaussian broadening)
momentum_resolution: (optional) NX_FLOAT {units=NX_WAVENUMBER}
Momentum resolution of the electron analyser (FWHM)
angular_resolution: (optional) NX_FLOAT {units=NX_ANGLE}
Angular resolution of the electron analyser (FWHM)
spatial_resolution: (optional) NX_FLOAT {units=NX_LENGTH}
Spatial resolution of the electron analyser (Airy disk radius)
fast_axes: (optional) NX_CHAR (Rank: 1, Dimensions: [nfa])
List of the axes that are acquired simultaneously by the detector. These refer only to the experimental variables recorded by the electron analyser. Other variables such as temperature, manipulator angles etc. are labeled as fast or slow in the data.
Examples¶ Mode
fast_axes
slow_axes
Hemispherical in ARPES mode
[‘energy’, ‘kx’]
Hemispherical with channeltron, sweeping energy mode
["energy"]
Tof
[‘energy’, ‘kx’, ‘ky’]
Momentum microscope, spin-resolved
[‘energy’, ‘kx’, ‘ky’]
[‘spin up-down’, ‘spin left-right’]
Axes may be less abstract than this, i.e. [‘detector_x’, ‘detector_y’]. If energy_scan_mode=sweep, fast_axes: [‘energy’, ‘kx’]; slow_axes: [‘energy’] is allowed.
slow_axes: (optional) NX_CHAR (Rank: 1, Dimensions: [nsa])
List of the axes that are acquired by scanning a physical parameter, listed in order of decreasing speed. See fast_axes for examples.
depends_on: (optional) NX_CHAR
Refers to the last transformation specifying the positon of the manipulator in the NXtransformations chain.
TRANSFORMATIONS: (optional) NXtransformations
Collection of axis-based translations and rotations to describe the location and geometry of the manipulator as a component in the instrument. Conventions from the NXtransformations base class are used. In principle, the McStas coordinate system is used. The first transformation has to point either to another component of the system or . (for pointing to the reference frame) to relate it relative to the experimental setup. Typically, the components of a system should all be related relative to each other and only one component should relate to the reference coordinate system.
COLLECTIONCOLUMN: (optional) NXcollectioncolumn
Describes the electron collection (spatial and momentum imaging) column
ENERGYDISPERSION: (optional) NXenergydispersion
Describes the energy dispersion section
SPINDISPERSION: (optional) NXspindispersion
Describes the spin dispersion section
DETECTOR: (optional) NXdetector
Describes the electron detector
DEFLECTOR: (optional) NXdeflector
Deflectors outside the main optics ensambles described by the subclasses
LENS_EM: (optional) NXlens_em
Individual lenses outside the main optics ensambles described by the subclasses
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.