IndirectTransmission dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| Instrument | Input | string | IRIS | Instrument. Allowed values: [‘IRIS’, ‘OSIRIS’, ‘TOSCA’, ‘BASIS’, ‘VISION’, ‘IN16B’] |
| Analyser | Input | string | graphite | Analyser. Allowed values: [‘graphite’, ‘mica’, ‘fmica’, ‘silicon’] |
| Reflection | Input | string | 2 | Reflection. Allowed values: [‘002’, ‘004’, ‘006’, ‘111’, ‘311’] |
| ChemicalFormula | Input | string | Mandatory | Sample chemical formula |
| DensityType | Input | string | Mass Density | Use of Mass density or Number density. Allowed values: [‘Mass Density’, ‘Number Density’] |
| Density | Input | number | 0.1 | Mass density (g/cm^3) or Number density (atoms/Angstrom^3). Default=0.1 |
| Thickness | Input | number | 0.1 | Sample thickness (cm). Default=0.1 |
| OutputWorkspace | Output | Workspace | Mandatory | The name of the output workspace. |
Calculates the scattering & transmission for Indirect Geometry spectrometers at the elastic peak, as the transmission variation over wavelength is not substantial.
The sample chemical formula is input for the SetSampleMaterial algorithm to calculate the cross-sections. The instrument analyser reflection is selected to obtain the wavelength of the elastic peak to calculate the absorption cross-section. The sample mass density/number density & thickness is input to then calculate the percentage scattering & transmission.
Example - Running IndirectTransmission.
table_ws = IndirectTransmission(Instrument='IRIS', ChemicalFormula="C")
param_names = table_ws.column(0)
param_values = table_ws.column(1)
for pair in zip(param_names, param_values):
print "%s : %s" % pair
Output:
Wavelength : 6.65800233718
Absorption Xsection : 0.0129590747304
Coherent Xsection : 5.551
Incoherent Xsection : 0.001
Total scattering Xsection : 5.552
Number density : 0.00501398069222
Thickness : 0.1
Transmission (abs+scatt) : 0.997213629421
Total scattering : 0.00277989100754
Example - Running IndirectTransmission with a specified number density and thickness.
table_ws = IndirectTransmission(Instrument='OSIRIS', DensityType='Number Density', Density=0.5, Thickness=0.3, ChemicalFormula="C")
param_names = table_ws.column(0)
param_values = table_ws.column(1)
for pair in zip(param_names, param_values):
print "%s : %s" % pair
Output:
Wavelength : 6.65800233718
Absorption Xsection : 0.0129590747304
Coherent Xsection : 5.551
Incoherent Xsection : 0.001
Total scattering Xsection : 5.552
Number density : 0.5
Thickness : 0.3
Transmission (abs+scatt) : 0.433985627752
Total scattering : 0.565169943961
Categories: Algorithms | Workflow\MIDAS
Python: IndirectTransmission.py