2.3.3.3.165. NXopt_window

Status:

base class, extends NXaperture

Description:

A window of a cryostat, heater, vacuum chamber or a simple glass slide. ...

A window of a cryostat, heater, vacuum chamber or a simple glass slide.

This first verion originates from NXopt to describe cryostate windows and possible influences for ellipsometry measurements.

For environmental measurements, the environment (liquid, vapor etc.) is enclosed in a cell, which has windows both in the direction of the source (entry window) and the detector (exit window) (looking from the sample). In case that the entry and exit windows are not the same type and do not have the same properties, use a second ‘WINDOW(NXaperture)’ field.

The windows also add a phase shift to the light altering the measured signal. This shift has to be corrected based on measuring a known sample (reference sample) or the actual sample of interest in the environmental cell. State if a window correction has been performed in ‘window_effects_corrected’. Reference data should be considered as a separate experiment, and a link to the NeXus file should be added in reference_data_link in measured_data.

The window is considered to be a part of the sample stage but also beam path. Hence, its position within the beam path should be defined by the ‘depends_on’ field.

Symbols:

No symbol table

Groups cited:

NXentry, NXprocess

Structure:

ENTRY: (optional) NXentry

window_effects_corrected: (optional) NX_BOOLEAN

Was a window correction performed? If 'True' describe the window ...

Was a window correction performed? If ‘True’ describe the window correction procedure in ‘window_correction/procedure’.

window_effects_type: (optional) NX_CHAR

Type of effects due to this window on the measurement. ...

Type of effects due to this window on the measurement.

Any of these values:

  • interference effects

  • light absorption

  • light scattering

  • other

material: (optional) NX_CHAR

The material of the window. ...

The material of the window.

Any of these values:

  • quartz

  • diamond

  • calcium fluoride

  • zinc selenide

  • thallium bromoiodide

  • alkali halide compound

  • Mylar

  • other

material_other: (optional) NX_CHAR

If you specified ‘other’ as material, decsribe here what it is.

thickness: (optional) NX_FLOAT {units=NX_LENGTH}

Thickness of the window.

orientation_angle: (optional) NX_FLOAT {units=NX_ANGLE}

Angle of the window normal (outer) vs. the substrate normal ...

Angle of the window normal (outer) vs. the substrate normal (similar to the angle of incidence).

window_correction: (optional) NXprocess ⤆

Was a window correction performed? If 'True' describe the ...

Was a window correction performed? If ‘True’ describe the window correction procedure in ‘’

procedure: (optional) NX_CHAR

Describe when (before or after the main measurement + time ...

Describe when (before or after the main measurement + time stamp in ‘date’) and how the window effects have been corrected, i.e. either mathematically or by performing a reference measurement. In the latter case, provide the link to to the reference data in ‘reference_data_link’.

reference_data_link: (optional) NX_CHAR

Link to the NeXus file which describes the reference data if a ...

Link to the NeXus file which describes the reference data if a reference measurement for window correction was performed. Ideally, the reference measurement was performed on a reference sample and on the same sample, and using the same conditions as for the actual measurement with and without windows. It should have been conducted as close in time to the actual measurement as possible.

Hypertext Anchors

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

NXDL Source:

https://github.com/FAIRmat-NFDI/nexus_definitions/tree/fairmat/contributed_definitions/NXopt_window.nxdl.xml