Langmuir Report

The Langmuir calculation determines the surface area of a sample by relating the surface area to the volume of gas adsorbed as a monolayer. Langmuir uses a single layer model.

Langmuir Report
Field or Button Description
Pressures [button]

This option is available when the sample file has a status of Analyzing or Complete. Use to enter a range of pressure points to be included in the report or to modify table values for pressure points.

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.

Use Interpolation. Use to indicate if the system should use the table or interpolated data. This option is available for BET and Langmuir reports only.

Select Pressure Range for Langmuir fit [group box] Enter values to indicate the fitted pressure range.
Select Reports [group box] Langmuir Isotherm Plot. Uses the Langmuir monolayer volume and constant to produce an isotherm.
  • Autoscale x-axis. Linear x-axes begin at zero. The x‑axis field shows the absolute pressure for Langmuir.
  • Autoscale y-axis. The y-axis field shows the quantity of gas adsorbed.
  • Overlay samples. Use to overlay sample files on the Langmuir isotherm plot.
Langmuir Transform Plot. Use to generate a traditional Langmuir surface area plot used to determine monolayer volume constant.
  • Autoscale x-axis. Linear x-axes begin at zero. The x‑axis field shows the absolute pressure for Langmuir.
  • Autoscale y-axis. The y-axis field shows Langmuir transformation.
  • Overlay samples. Use to overlay sample files on the Langmuir transform plot.
  For fields and buttons not listed in this table, see Common Fields and Buttons.