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 XPS  Level 3  Start an acquisition.

 Start an acquisition.

The "Wide_scan" acquisition allows to identify the various chemical components of the specimen. To study the nature of the chemical bonds, we must define an acquisition window for each individual component. In the example below, the study relates to carbon, C1s level and to fluorine, F1s level.

In each one of these windows, acquisition is done in 0.1 eV steps, this resolution allows a study by modeling for each element the various chemical contributions.

In the event of difficulties for the chemical state identification - overlapping peaks, badly defined states -, it is useful to double certain acquisition areas. Recording a second level or/and an Auger transition usually solves these problems.

Thus, the distance between the principal peak and an Auger transition or the shape of this transition, are often used to solve these difficulties.

Here is the spectrum of the C1s level obtained after an acquisition which can vary between 10 seconds and 10 minutes according to the spectrometer type and the quantity of matter. Now we have to identify the five chemical states composing this level.

Spectrum of the C1s level: Acquisition step 0.1