Alpha-S Method Report
The Alpha-S plot converts the standard adsorption isotherm into a dimensionless isotherm using the quantity adsorbed at a relative pressure of 0.4.
One predefined curve is located in the Reference file directory. Use the table buttons to enter relative pressure and the Alpha-S values.
Field or Button | Description | ||
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Open [button] | Use to import values from an existing thickness curve (.ALS). The table to be imported must be saved as ASCII text with a .ALS file extension. It must have a two-column format with the relative pressures in the first column and the alpha-s values in the second column. Columns must be separated by a space or a tab. |
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Pressures [button] | Use to select a pressure range for report calculations and points for exclusion from calculations. Calculation pressure range. Enter the minimum and maximum pressures to be used in the pressure table.To exclude a point from the calculations used to generate the report, select Exclude. Exclude All. Select to exclude all pressure points in the table. Include All. Select to include all pressure points in the table. |
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Ref. surface area [text box] |
Enter the surface area from the reference curve. This value is used to calculate the sample surface area. | ||
Select Range for Alpha-S Fit [group box] |
Enter minimum and maximum relative pressures to determine the fit. | ||
Selected Reports [group box] |
Alpha-S Plot. Use to plot data in graph format.
Tabular Report. Use to have a tabular report of data generated. |
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