Selecting Endpoints

XPS

Selecting endpoints lets you identify the baseline in an XPS acquisition. From the baseline, a peak’s height can be determined.

AugerScan uses this information to calculate atomic concentrations. Two methods are provided for calculating atomic concentrations. One calculation method uses the peak height with respect to the base line. The other calculation method uses the area under the curve that is created once the baseline has been defined.

AES

You can also select endpoints in an AES multiplex or depth profile. In this case, the endpoints determine the upper and lower limits used for calculating the atomic concentration (without endpoints, the limits of the region itself are used)

To select endpoints:

  1. Open the XPS survey, depth profile (region and cycle data), or multiplex (survey data), or the AES multiplex or profile..

  2. Select the Select Endpoints command from the Edit menu or click on the Select Endpoints button in the Main toolbar.

  3. Identify where you want the endpoints to be.

  4. Zoom in on the area you will be using to identify the endpoints to make the peaks easier to see.

  5. Click with the left mouse button on the data point that you want as your first endpoint and while still holding down the mouse button, drag the mouse towards the other endpoint. A vertical line appears at the first endpoint and another vertical line follows the path of the mouse as you drag it. When you have reached the second data point, release the left mouse button. Your data should look similar to the following graph. (Note that when you are working with surveys (not multiplexes or depth profiles), the vertical lines are not displayed. Also, note that AES endpoints do not draw a baseline, since it does not apply)

    Auge0001.gif