Extending the Spectrum Range
Benefits of Extending Spectrum Range
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.
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.
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
Total # of slides: 92