ASTM-E984:12(R2020) pdf free download – Standard Guide for ldentifying Chemical Effects and Matrix Effects in Auger Electron Spectroscopy.
Al and Mg (15). In single crystals. diffraction effects will produce different lineshapes (16). Relative intensities of several Auger transitions may change. either from attenuation of overlayers (17), or from different chemical states resulting in different Auger transition probabilities (18 and 19). Phonon broadening and inelastic electron energy loss effects will result in different linewidths and backgrounds for gases, adsorbates. and condensed phases (20).
5.5 For both X-ray and electron excited Auger spectra. quantitative corrections for matrix effects are discussed in detail in ISO 18118:2004.
6. Guidelines for Reporting Auger Chemical and Matrix Effects
6.1 In general, the guidelines outlined in Practice E996 should be used. This practice covers reporting of the spectrometer, specimen preparation, excitation source, analyzer and detector modes, and data processing. Also, if measures were taken to control damage or charging of the specimen, report those conditions in a manner consistent with Guide E983.
6.1.1 Practice E827 should be used to confirm the elemental identification. The elemental information should be consistent with the presumed chemical state identification.
6.1.2 When reporting chemical and matrix effects in an Auger spectrum. the main feature of interest is the Auger peak energy (reported in eV). This is the energy of the largest negative excursion in the dN/dE spectrum or the most intense peak in the N(E) spectrum. (Of course, these two peak positions’ measurements will have different energy values.) The energy location of the major Auger peak should he in agreement with the reference value, consistent with the experimental parameters and calibrations as discussed in Practice E996.
6.1.3 The reference level for the energy scale of the electron energy analyzer and the method for calibrating the energy scale should be specified. The relative peak energy shifts between the chemical states of interest and that element in its elemental state (or some other standard state) should also be reported.
6.1.4 Other spectral features which may be useful include the number, relative energy positions. and relative signal strengths of the secondary peaks. The reporting of these values should also be in agreement with the reference value and consistent with the experimental parameters and calibrations discussed in Practice E996.
6.2 When spectra are presented for publication, the energy range should be wide enough that the shape of the background on either side of the Auger line is apparent. Shown in Fig. 7 are Auger spectra for several sulfur-containing compounds, and in Table I information from these spectra.
7. Keywords
7.1 Auger electron spcctroscopy: chemical effect; matrix effect: spcctroscopy.