The slope-background is designed to reproduce the change on the slope of the background between the two sides of the peaks. This is exemplified in the figure below; the plot corresponds to the Si 2 p spectrum from a clean silicon wafer. As described for the active-background method, the total background is the sum of various components. As illustrated in the inset, in this case the components are a baseline, the step or Shirley-Sherwood background, and the slope -background. The slope-background is responsible for reproducing the slope of the background on the left side of the spectrum. In turn, the Shirley-Sherwood background is responsible for reproducing the step on the intensity of the background between the two sides of the peaks. The step and the slope background together reproduce the total background in great detail, providing excellent fits and precise assessments of the peak areas.
The slope-background is a simplified version of the Tougaard's backgrounds. In some instances it could be called the “one-parameter Tougaard background”. It is simplified in the sense that it is very simple to use since no input parameters from the user are required.