3.3.3.39. NXmpes

Status:

application definition, extends NXobject

Description:

This is the most general application definition for multidimensional photoelectron spectroscopy.

Symbols:

No symbol table

Groups cited:

NXaperture, NXbeam, NXcalibration, NXcollectioncolumn, NXdata, NXdetector, NXelectronanalyser, NXenergydispersion, NXentry, NXinstrument, NXmanipulator, NXnote, NXprocess, NXsample, NXsource

Structure:

ENTRY: (required) NXentry

title: (required) NX_CHAR

start_time: (required) NX_DATE_TIME

Datetime of the start of the measurement.

definition: (required) NX_CHAR

Obligatory value: NXmpes

@version: (required) NX_CHAR

INSTRUMENT: (required) NXinstrument

energy_resolution: (required) NX_FLOAT

SOURCE: (required) NXsource

The source used to generate the primary photons. Properties refer strictly to parameters of the source, not of the output beam. For example, the energy of the source is not the optical power of the beam, but the energy of the electron beam in a synchrotron and so on.

type: (required) NX_CHAR

Any of these values:

  • Synchrotron X-ray Source

  • Rotating Anode X-ray

  • Fixed Tube X-ray

  • UV Laser

  • Free-Electron Laser

  • Optical Laser

  • UV Plasma Source

  • Metal Jet X-ray

  • HHG laser

name: (required) NX_CHAR

probe: (required) NX_CHAR

Type of probe. In photoemission it’s always photons, so the full NIAC list is restricted.

Any of these values: x-ray | ultraviolet | visible light

BEAM: (required) NXbeam

distance: (required) NX_NUMBER

Distance of the point of evaluation of the beam from the sample surface.

incident_energy: (required) NX_FLOAT

incident_energy_spread: (recommended) NX_NUMBER

incident_polarization: (recommended) NX_NUMBER

ELECTRONANALYSER: (required) NXelectronanalyser

description: (required) NX_CHAR

energy_resolution: (recommended) NX_FLOAT

Energy resolution of the analyser with the current setting. May be linked from a NXcalibration.

fast_axes: (recommended) NX_CHAR

slow_axes: (recommended) NX_CHAR

COLLECTIONCOLUMN: (required) NXcollectioncolumn

scheme: (required) NX_CHAR

Scheme of the electron collection column.

Any of these values:

  • Standard

  • Angular dispersive

  • Selective area

  • Deflector

  • PEEM

  • Momentum Microscope

mode: (recommended) NX_CHAR

projection: (recommended) NX_CHAR

field_aperture: (optional) NXaperture

The size and position of the field aperture inserted in the column. To add additional or other apertures use the APERTURE group of NXcollectioncolumn.

contrast_aperture: (optional) NXaperture

The size and position of the contrast aperture inserted in the column. To add additional or other apertures use the APERTURE group of NXcollectioncolumn.

ENERGYDISPERSION: (required) NXenergydispersion

scheme: (required) NX_CHAR

Any of these values:

  • tof

  • hemispherical

  • double hemispherical

  • cylindrical mirror

  • display mirror

  • retarding grid

pass_energy: (required) NX_FLOAT

energy_scan_mode: (required) NX_CHAR

entrance_slit: (optional) NXaperture

Size, position and shape of the entrance slit in dispersive analyzers. To add additional or other slits use the APERTURE group of NXenergydispersion.

exit_slit: (optional) NXaperture

Size, position and shape of the exit slit in dispersive analyzers. To add additional or other slits use the APERTURE group of NXenergydispersion.

DETECTOR: (required) NXdetector

amplifier_type: (recommended) NX_CHAR

Type of electron amplifier in the first amplification step.

Any of these values: MCP | channeltron

detector_type: (recommended) NX_CHAR

Description of the detector type.

Any of these values:

  • DLD

  • Phosphor+CCD

  • Phosphor+CMOS

  • ECMOS

  • Anode

  • Multi-anode

DATA: (recommended) NXdata

@signal: (required) NX_CHAR

Obligatory value: raw

raw: (required) NX_NUMBER

Raw data before calibration.

MANIPULATOR: (optional) NXmanipulator

Manipulator for positioning of the sample.

sample_temperature: (recommended) NX_FLOAT

drain_current: (recommended) NX_FLOAT

sample_bias: (recommended) NX_FLOAT

PROCESS: (required) NXprocess

Document an event of data processing, reconstruction, or analysis for this data. Describe the appropriate axis calibrations for your experiment using one or more of the following NXcalibrations

energy_calibration: (optional) NXcalibration

applied: (required) NX_BOOLEAN

Has an energy calibration been applied?

calibrated_axis: (recommended) NX_FLOAT

This is the calibrated energy axis to be used for data plotting.

angular_calibration: (optional) NXcalibration

applied: (required) NX_BOOLEAN

Has an angular calibration been applied?

calibrated_axis: (recommended) NX_FLOAT

This is the calibrated angular axis to be used for data plotting.

spatial_calibration: (optional) NXcalibration

applied: (required) NX_BOOLEAN

Has an spatial calibration been applied?

calibrated_axis: (recommended) NX_FLOAT

This is the calibrated spatial axis to be used for data plotting.

momentum_calibration: (optional) NXcalibration

applied: (required) NX_BOOLEAN

Has an momentum calibration been applied?

calibrated_axis: (recommended) NX_FLOAT

This is the momentum axis to be used for data plotting.

SAMPLE: (required) NXsample

name: (required) NX_CHAR

chemical_formula: (recommended) NX_CHAR

The chemical formula of the sample. For mixtures use the NXsample_component group in NXsample instead.

preparation_date: (recommended) NX_DATE_TIME

Date of preparation of the sample for the XPS experiment (i.e. cleaving, last annealing).

temperature: (required) NX_FLOAT {units=NX_TEMPERATURE}

In the case of a fixed temperature measurement this is the scalar temperature of the sample. In the case of an experiment in which the temperature is changed and recoded, this is an array of length m of temperatures. This should be a link to /entry/instrument/manipulator/sample_temperature.

situation: (required) NX_CHAR

Any of these values:

  • vacuum

  • inert atmosphere

  • oxidising atmosphere

  • reducing atmosphere

gas_pressure: (required) NX_FLOAT

sample_history: (recommended) NXnote

A descriptor to keep track of the treatment of the sample before entering the photoemission experiment. Ideally, a full report of the previous operations, in any format (NXnote allows to add pictures, audio, movies). Alternatively, a reference to the location or a unique identifier or other metadata file. In the case these are not available, free-text description.

preparation_description: (required) NXnote

Description of the surface preparation technique for the XPS experiment, i.e. UHV cleaving, in-situ growth, sputtering/annealing etc. Ideally, a full report of the previous operations, in any format(NXnote allows to add pictures, audio, movies). Alternatively, a reference to the location or a unique identifier or other metadata file. In the case these are not available, free-text description.

DATA: (required) NXdata

@signal: (required) NX_CHAR

Obligatory value: data

data: (required) NX_NUMBER

Represents a measure of one- or more-dimensional photoemission counts, where the varied axis may be for example energy, momentum, spatial coordinate, pump-probe delay, spin index, temperature, etc. The axes traces should be linked to the actual encoder position in NXinstrument or calibrated axes in NXprocess.

Hypertext Anchors

List of hypertext anchors for all groups, fields, attributes, and links defined in this class.

NXDL Source:

https://github.com/nexusformat/definitions/blob/main/contributed_definitions/NXmpes.nxdl.xml