3.3.3.102. NXxas_trans¶
Status:
application definition (contribution), extends NXxas
Description:
In transmission, the linear attenuation coefficient or absorption …
In transmission, the linear attenuation coefficient or absorption coefficient \(\mu(E)\) is given by the Beer-Lambert law:
\[\mu(E)t = -\ln(I/I_0)\]where \(I\) is the intensity of the transmitted beam, \(I_0\) is the intensity of the incident beam, and \(t\) is the thickness of the sample.
The top-level intensity field contains the processed absorbance. When the raw detector data and processing steps are available, they can be stored in the recommended
NXinstrumentgroup and the optionalNXcollectionandNXprocessgroups, enabling full reproducibility of the data reduction.
Symbols:
No symbol table
- Groups cited:
NXcrystal, NXdetector, NXentry, NXinstrument, NXmonochromator, NXsource
Structure:
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_transintensity: (required) NX_FLOAT (Rank: dataRank) {units=NX_DIMENSIONLESS} ⤆
The absorbance \(\mu(E)t = -\ln(I/I_0)\), the product of …
The absorbance \(\mu(E)t = -\ln(I/I_0)\), the product of the absorption coefficient \(\mu(E)\) and the sample thickness \(t\).
INSTRUMENT: (recommended) NXinstrument ⤆
The
datafield of each detector below holds the intensity …The
datafield of each detector below holds the intensity used to compute the absorbance and may already include corrections. If the uncorrected values are kept, they are archived in theNXcollectiongroup and the corrections are described inNXprocess.SOURCE: (recommended) NXsource ⤆
monochromator: (recommended) NXmonochromator ⤆
crystal: (recommended) NXcrystal ⤆
d_spacing: (required) NX_FLOAT {units=NX_LENGTH} ⤆
The spacing between crystal planes of the reflection
Type or material of monochromating substance …
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
i0: (recommended) NXdetector ⤆
itrans: (recommended) NXdetector ⤆
iref: (recommended) NXdetector ⤆
Detector measuring the reference intensity …
Detector measuring the reference intensity \(I_{ref}\), placed after a reference sample (typically a metal foil). Provide this detector when the reference is a simultaneous transmission channel that shares the main energy axis. For a reference that is an independent spectrum, in particular one probing a different absorbing element or absorption edge, use the reference subentry instead. Do not provide both for the same reference.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.