.. auto-generated by dev_tools.docs.nxdl from the NXDL source contributed_definitions/NXchemical_composition.nxdl.xml -- DO NOT EDIT

.. index::
    ! NXchemical_composition (base class)
    ! chemical_composition (base class)
    see: chemical_composition (base class); NXchemical_composition

.. _NXchemical_composition:

======================
NXchemical_composition
======================

**Status**:

  base class, extends :ref:`NXobject`

**Description**:

  (Chemical) composition of a sample or a set of things.

**Symbols**:

  The symbols used in the schema to specify e.g. dimensions of arrays.

  **n**: The number of samples or things.

**Groups cited**:
  :ref:`NXion`

.. index:: NXion (base class); used in base class

**Structure**:

  .. _/NXchemical_composition/total-field:

  .. index:: total (field)

  **total**: (optional) :ref:`NX_NUMBER <NX_NUMBER>` (Rank: 1, Dimensions: [n]) {units=\ :ref:`NX_UNITLESS <NX_UNITLESS>`}

    Total based on which composition information is normalized.

  .. _/NXchemical_composition/ION-group:

  **ION**: (optional) :ref:`NXion`


    .. _/NXchemical_composition/ION/count-field:

    .. index:: count (field)

    **count**: (optional) :ref:`NX_NUMBER <NX_NUMBER>` (Rank: 1, Dimensions: [n]) {units=\ :ref:`NX_UNITLESS <NX_UNITLESS>`}

      Count or weight which, when divided by total yields the composition
      of this element, isotope, molecule or ion.

    .. _/NXchemical_composition/ION/composition-field:

    .. index:: composition (field)

    **composition**: (optional) :ref:`NX_NUMBER <NX_NUMBER>` (Rank: 1, Dimensions: [n]) {units=\ :ref:`NX_DIMENSIONLESS <NX_DIMENSIONLESS>`}

      Count divided by total in atom percent.


Hypertext Anchors
-----------------

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


* :ref:`/NXchemical_composition/ION-group </NXchemical_composition/ION-group>`
* :ref:`/NXchemical_composition/ION/composition-field </NXchemical_composition/ION/composition-field>`
* :ref:`/NXchemical_composition/ION/count-field </NXchemical_composition/ION/count-field>`
* :ref:`/NXchemical_composition/total-field </NXchemical_composition/total-field>`

**NXDL Source**:
  https://github.com/nexusformat/definitions/blob/main/contributed_definitions/NXchemical_composition.nxdl.xml