2.3.3.3.93. NXem_eds¶
Status:
base class (contribution), extends NXprocess
Description:
Base class method-specific for energy-dispersive X-ray spectroscopy (EDS/EDXS). ...
Base class method-specific for energy-dispersive X-ray spectroscopy (EDS/EDXS).
IUPAC instead of Siegbahn notation should be used.
X-ray spectroscopy is a surface-sensitive technique. Therefore, three-dimensional elemental characterization requires typically a sequence of characterization and preparation of the surface to expose new surface layer that can be characterized in the next acquisition. In effect, the resulting three-dimensional elemental information mappings are truly the result of a correlation and post-processing of several measurements which is the field of correlative tomographic usage of electron microscopy.
Symbols:
n_photon_energy: Number of X-ray photon energy (bins)
n_elements: Number of identified elements
n_peaks: Number of peaks detected
n_iupac_line_names: Number of IUPAC line names
Structure:
indexing: (optional) NXprocess
Details about computational steps how peaks were indexed as elements.
atom_types: (optional) NX_CHAR (Rank: 1, Dimensions: [n_elements])
Comma-separated list of symbols for elements from the periodic table that ha ...
Comma-separated list of symbols for elements from the periodic table that have been confirmed present by the here reported EDS analysis.
This field can be used when creating instances of NXpeak is not desired. However, a collection of instances of NXpeak with individual NXatom can be used to add isotopic information and other relevant context.
PROGRAM: (optional) NXprogram
The program with which the indexing was performed.
Accumulated intensity over all pixels of the region-of-interest.
intensity: (optional) NX_NUMBER (Rank: 1, Dimensions: [n_photon_energy]) {units=NX_UNITLESS}
axis_energy: (optional) NX_NUMBER (Rank: 1, Dimensions: [n_photon_energy]) {units=NX_ENERGY}
PEAK: (optional) NXpeak
Details about individual indexed peaks.
ATOM: (optional) NXatom
energy_range: (optional) NX_NUMBER (Rank: 1, Dimensions: [2]) {units=NX_ENERGY}
Associated lower :math:`[e_{min}, e_{max}]` bounds of the ...
Associated lower \([e_{min}, e_{max}]\) bounds of the energy which is assumed associated with this peak.
energy: (optional) NX_NUMBER {units=NX_ENERGY}
Theoretical energy of the line according to IUPAC.
iupac_line_name: (optional) NX_CHAR (Rank: 1, Dimensions: [n_iupac_line_names])
IUPAC notation identifier of the line which the peak represents. ...
IUPAC notation identifier of the line which the peak represents.
This can be a list of IUPAC notations for (the seldom) case that multiple lines are grouped with the same peak.
IMAGE: (optional) NXimage
Individual element-specific EDS/EDX/EDXS/SXES mapping ...
Individual element-specific EDS/EDX/EDXS/SXES mapping
A composition map is an image whose intensities for each pixel are the accumulated X-ray quanta under the curve(s) of a set of peaks.
These element-specific EDS maps are instances of NXimage that should be named by the element from the atom_types field.
When signal contributions from several peaks were decomposed users should ideally use a respective number of NXpeak instances to give further context about the individual signal contributions are summarized and shown together, e.g. the combined signal under the curve of carbon and oxygen.
In this case specify the processing details use peak and weight.
description: (optional) NX_CHAR
Discouraged free-text field to add additional information.
iupac_line_candidate: (optional) NX_CHAR
Comma-separated list of chemical_symbol-IUPAC X-ray (emission) line name t ...
Comma-separated list of chemical_symbol-IUPAC X-ray (emission) line name that documents which elements and their specific lines are theoretically located within the energy_range of the spectrum from which the EDS (element) map was computed.
energy_range: (optional) NX_NUMBER (Rank: 1, Dimensions: [2]) {units=NX_ENERGY}
Associated :math:`[e_{min}, e_{max}]` bounds of the energy ...
Associated \([e_{min}, e_{max}]\) bounds of the energy range for which spectrum counts were accumulated.
PROCESS: (optional) NXprocess ⤆
peak: (optional) NX_CHAR (Rank: 1, Dimensions: [n_peaks])
A list of :ref:`NXpeak` instance names whose X-ray quanta were ...
A list of NXpeak instance names whose X-ray quanta were accumulated for each pixel to obtain an element-specific EDS map.
weight: (optional) NX_NUMBER {units=NX_UNITLESS}
A list of weights by how much the intensity of each peak ...
A list of weights by how much the intensity of each peak contributes to the intensity of the EDS map.
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List of hypertext anchors for all groups, fields, attributes, and links defined in this class.
