3.3.1.25. NXgrating¶
Status:
base class, extends NXobject
Description:
A diffraction grating, as could be used in a soft X-ray monochromator
Symbols:
No symbol table
- Groups cited:
Structure:
@default: (optional) NX_CHAR
Declares which child group contains a path leading to a NXdata group.
It is recommended (as of NIAC2014) to use this attribute to help define the path to the default dataset to be plotted. See https://www.nexusformat.org/2014_How_to_find_default_data.html for a summary of the discussion.
angles[2]: (optional) NX_FLOAT {units=NX_ANGLE}
Blaze or trapezoidal angles, with the angle of the upstream facing edge listed first. Blazed gratings can be identified by the low value of the first-listed angle.
period[]: (optional) NX_FLOAT {units=NX_LENGTH}
List of polynomial coefficients describing the spatial separation of lines/grooves as a function of position along the grating, in increasing powers of position. Gratings which do not have variable line spacing will only have a single coefficient (constant).
duty_cycle: (optional) NX_FLOAT {units=NX_UNITLESS}
depth: (optional) NX_FLOAT {units=NX_LENGTH}
diffraction_order: (optional) NX_INT {units=NX_UNITLESS}
deflection_angle: (optional) NX_FLOAT {units=NX_ANGLE}
Angle between the incident beam and the utilised outgoing beam.
interior_atmosphere: (optional) NX_CHAR
Any of these values:
vacuum|helium|argonsubstrate_material: (optional) NX_CHAR
substrate_density: (optional) NX_FLOAT {units=NX_MASS_DENSITY}
substrate_thickness: (optional) NX_FLOAT {units=NX_LENGTH}
coating_material: (optional) NX_CHAR
substrate_roughness: (optional) NX_FLOAT {units=NX_LENGTH}
coating_roughness: (optional) NX_FLOAT {units=NX_LENGTH}
layer_thickness: (optional) NX_FLOAT {units=NX_LENGTH}
An array describing the thickness of each layer
shape: (optional) NXshape
A NXshape group describing the shape of the mirror
figure_data: (optional) NXdata
Numerical description of the surface figure of the mirror.
TRANSFORMATIONS: (optional) NXtransformations
“Engineering” position of the grating
Hypertext Anchors¶
Table of hypertext anchors for all groups, fields, attributes, and links defined in this class.
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