3.3.3.103. NXxas

Status:

application definition (contribution), extends NXobject

Description:

This is a generic application definition for X-ray absorption ...

This is a generic application definition for X-ray absorption spectroscopy. Technique-specific application definitions extend this base definition.

Symbols:

The symbol(s) listed here will be used below to coordinate datasets ...

The symbol(s) listed here will be used below to coordinate datasets with the same shape.

nEnergy: Number of energy data points

Groups cited:

NXabsorption_edge, NXatom, NXdata, NXentry, NXsample

Structure:

ENTRY: (required) NXentry

definition: (required) NX_CHAR ⤆

Official NeXus NXDL schema to which this file conforms. ...

Official NeXus NXDL schema to which this file conforms.

Obligatory value: NXxas

element: (required) NXatom

The atom being probed by the incident X-rays.

name: (required) NX_CHAR ⤆

edge: (required) NXabsorption_edge

The absorption edge being probed, defined by the principal ...

The absorption edge being probed, defined by the principal quantum number and orbital symmetry of the photoionized electron (e.g. K, L1, L2, L3, L2,3). Together with the element uniquely identifies probed electronic transition.

is_experimental: (required) NX_BOOLEAN

Specify if the data comes from an experiment. Use ``true`` for ...

Specify if the data comes from an experiment. Use true for data acquired at a beamline or laboratory instrument, and false for spectra calculated/simulated using a computational tool, reconstructed from a linear combination of reference components, etc.

energy: (required) NX_FLOAT (Rank: 1, Dimensions: [nEnergy]) {units=NX_ENERGY}

The energy axis of the spectrum.

intensity: (required) NX_FLOAT (Rank: 1, Dimensions: [nEnergy]) {units=NX_ANY}

The intensity of the spectrum. The precise definition of what is ...

The intensity of the spectrum. The precise definition of what is meant by intensity depends on the acquisition mode, and will be specified by each subclass application definition.

intensity_errors: (optional) NX_FLOAT (Rank: 1, Dimensions: [nEnergy]) {units=NX_ANY}

The errors associated with the intensity of the spectrum.

SAMPLE: (required) NXsample ⤆

name: (required) NX_CHAR ⤆

Descriptive name of the sample

DATA: (optional) NXdata ⤆

Plot of the X-ray absorption intensity versus energy

energy: link (suggested target: /NXentry/energy)

intensity: link (suggested target: /NXentry/intensity)

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/NXxas.nxdl.xml