Extending the Spectrum Range
Tutorial
Benefits of Extending Spectrum Range
Tutorial:
The following Tutorial presents a proposal for Extending the High-Resolution spectrum range of an individual core level in XPS
from the traditional 20ev to the more-versatile 50ev window providing more information and a window for improving atom% quantitation for new XPS instruments that have very significant improvements in counting rates, saving time.
Objective:
Demonstrate, by using a set of examples across different materials, that range expansion plus improved statistics, allowing scale expansion to see small features, reveals new information and enables more reliable quantification.
Historical:
The traditional range for recording a high-resolution core level spectrum is 20ev (sometimes 30ev), with the peak in question centered, as in the O1s spectrum of a single crystal of Al2O3. In older instruments a spectrum of this signal/noise and resolution might have taken 20 minutes or more. With modern instruments the 50ev range with statistics as shown (5 minutes) , allows observation of where the background after the main peak starts (at the band gap), and reveals the substructure on that background.
Questions answered in this presentation
- What can we learn by extending the Traditional 20 eV Chemical State Spectrum Width to a 50 eV Spectrum Width?
- Will a 50 eV wide spectrum width produce more accurate quantitation?
- Answers are shown throughout this Tutorial
Goals of Presentation
- Demonstrate that 50 eV spectra chemical state windows provide significant information
- Demonstrate that large vertical expansions reveal un-explored weak signals that offer new information
- Demonstrate that large vertical expansions are very useful to reveal best placement of background endpoints
- Demonstrate that traditional 20 eV width spectra are missing important and, in some cases significant information
To Download Presentation in PDF form click here.
Total # of slides: 92
The End
Thank you!