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:
- Open the XPS survey, depth profile (region and cycle data), or multiplex
(survey data), or the AES multiplex or profile..
- Select the Select Endpoints command from the Edit menu or click on the Select
Endpoints button in the Main toolbar.
- Identify where you want the endpoints to be.
- Zoom in on the area you will be using to identify the endpoints to make the
peaks easier to see.
- 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)