3.3.2.27. NXxas_new

Status:

application definition, extends NXobject

Description:

This is an application definition for X-ray absorption spectroscopy.

Symbols:

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

nEnergy: Number of energy data points

nTransitions: Number of electronic transitions

Groups cited:

NXcollection, NXcrystal, NXdata, NXdetector, NXelectron_level, NXelement, NXentry, NXinstrument, NXmonochromator, NXprocess, NXsample, NXsource, NXuser

Structure:

ENTRY: (required) NXentry

definition: (required) NX_CHAR ⤆

Official NeXus NXDL schema to which this file conforms. TODO: replace NXxas ...

Official NeXus NXDL schema to which this file conforms. TODO: replace NXxas

Obligatory value: NXxas_new

mode: (required) NX_CHAR

Any of these values:

  • transmission: TODO

  • fluorescence yield: TODO total or partial fluorescence yield

  • herfd: TODO high energy resolution fluorescence detected

  • electron yield: TODO total or partial electron yield

  • luminescence: TODO

  • calculated: TODO

  • x-ray Raman: TODO

  • electron energy loss: TODO

  • dafs: TODO

  • other: TODO

emission_line: (optional) NX_CHAR (Rank: 1, Dimensions: [nTransitions])

Emission lines relevant when :ref:`mode ` is ...

Emission lines relevant when mode is fluorescence yield or herfd.

The emission lines are described as a list of names of the form “INITIAL-FINAL” where INITAL and FINAL are electron levels as listed for here.

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

TODO

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

TODO

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

TODO

element: (required) NXelement

Excited element

symbol: (required) NX_CHAR ⤆

absorption_edge: (required) NXelectron_level

Excited electron level

name: (required) NX_CHAR ⤆

SAMPLE: (required) NXsample ⤆

name: (required) NX_CHAR ⤆

Descriptive name of the sample

PROCESS: (optional) NXprocess ⤆

Description on how :ref:`energy ` ...

Description on how energy and intensity were obtained from the raw data.

INSTRUMENT: (optional) NXinstrument ⤆

SOURCE: (required) NXsource ⤆

type: (required) NX_CHAR ⤆

name: (required) NX_CHAR ⤆

probe: (required) NX_CHAR ⤆

Obligatory value: x-ray

monochromator: (optional) NXmonochromator ⤆

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

crystal: (optional) NXcrystal ⤆

d_spacing: (required) NX_FLOAT {units=NX_LENGTH} ⤆

spacing between crystal planes of the reflection

type: (required) NX_CHAR ⤆

Type or material of monochromating substance (Si, Ge, Multilayer).

reflection: (required) NX_INT (Rank: 1, Dimensions: [3]) {units=NX_UNITLESS} ⤆

Miller indices (hkl) values of nominal reflection

DETECTOR: (optional) NXdetector ⤆

data: (required) NX_NUMBER (Rank: 1, Dimensions: [nEnergy]) ⤆

i0: (optional) NXdetector ⤆

data: (required) NX_NUMBER (Rank: 1, Dimensions: [nEnergy]) ⤆

DATA: (optional) NXdata ⤆

XAS intensity versus energy plot

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

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

COLLECTION: (optional) NXcollection

DATA: (optional) NXdata

Table like data structure common in the XAS domain.

data: (required) NX_NUMBER (Rank: 2, Dimensions: [nChan, nEnergy])

columns: (required) NX_CHAR (Rank: 1, Dimensions: [nEnergy])

data_collector: (optional) NXuser

name: (required) NX_CHAR

orcid: (required) NX_CHAR

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/applications/NXxas_new.nxdl.xml