BS ISO 19830:2015 pdf download – Surface chemical analysis — Electron spectroscopies — Minimum reporting requirements for peak fitting in X-ray photoelectron spectroscopy.
5 Reporting of single-spectrum peak-fitting parameters 5.1 General This Clause applies to the type of measurement that leads to the acquisition of individual spectra. A later Clause will apply to measurements that lead to multiple spectra, examples of which are depth profiles, line scans, and the type of images which have a spectrum at each pixel. The Clause describes parameters which shall be reported together with any fitting constraints or linkages. 5.2 Background range When peak-fitting is carried out on a spectrum, it is necessary to consider the background. The chosen background should extend beyond the peak envelope at both higher and lower binding energies. There are circumstances under which the choice of background range can severely affect the values calculated for the peak areas (for example, when there is an energy loss feature in the spectrum close to the peak being fitted). For this reason, the energy of each extreme of the fitted background shall be reported along with the type of averaging algorithm used (arithmetic average, polynomial fit, etc.) if this is known. 5.3 Background integration range If the background contains significant noise, it might be necessary to take an average intensity over a range of energies at each end of the chosen background range. This defines more accurately the start and end positions of the background on the intensity axis. If background averaging has been used, then that shall be reported along with the energy range or number of data points from which the average has been calculated. A detailed explanation of how and why peak intensities depend upon the chosen limits for the background is given in Reference [3] and Reference [4]. Some of the factors involved here include the presence of energy-loss features and shake-up peaks and how the relative intensity of these features can depend upon the chemical state of the element.