.. auto-generated by script ../../../../utils/nxdl2rst.py from the NXDL source NXxnb.nxdl.xml

.. index::
    ! NXxnb (application definition)
    ! xnb (application definition)
    see: xnb (application definition); NXxnb

.. _NXxnb:

=====
NXxnb
=====

**Status**:

  application definition, extends :ref:`NXxbase`

**Description**:

  raw data from a single crystal diffractometer, extends :ref:`NXxbase`

  This is the application definition for raw data from 
  a single crystal diffractometer
  measuring in normal beam mode. It extends :ref:`NXxbase`, 
  so the full definition is the content of
  :ref:`NXxbase` plus the data defined here. All angles are 
  logged in order to support arbitrary scans in
  reciprocal space.

**Symbols**:

  No symbol table

**Groups cited**:
  :ref:`NXdata`, :ref:`NXdetector`, :ref:`NXentry`, :ref:`NXinstrument`, :ref:`NXsample`

.. index:: NXentry (base class); used in application definition, NXinstrument (base class); used in application definition, NXdetector (base class); used in application definition, NXsample (base class); used in application definition, NXdata (base class); used in application definition

**Structure**:

  **entry**: (required) :ref:`NXentry`


    .. index:: definition (field)

    **definition**: (required) :ref:`NX_CHAR <NX_CHAR>`

      Official NeXus NXDL schema to which this file conforms

      Obligatory value:  ``NXxnb``

    **instrument**: (required) :ref:`NXinstrument`


      **detector**: (required) :ref:`NXdetector`


        .. index:: polar_angle (field)

        **polar_angle[np]**: (required) :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

          The polar_angle (gamma) of the detector for each scan point.

        .. index:: tilt_angle (field)

        **tilt_angle[np]**: (required) :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

          The angle by which the detector has been tilted out of the
          scattering plane.

    **sample**: (required) :ref:`NXsample`


      .. index:: rotation_angle (field)

      **rotation_angle[np]**: (required) :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

        This is an array holding the sample rotation angle at each
        scan point

    **name**: (required) :ref:`NXdata`


      **polar_angle** --> /NXentry/NXinstrument/NXdetector/polar_angle


      **tilt** --> /NXentry/NXinstrument/NXdetector/tilt


      **rotation_angle** --> /NXentry/NXsample/rotation_angle


**NXDL Source**:
  https://github.com/nexusformat/definitions/blob/master/applications/NXxnb.nxdl.xml