Probing the influence of temperature on defects in oxy-hydroxide ceramics by positron annihilation lifetime and coincidence Doppler broadening spectroscopy

Characterization of polar groups in polyvinyl chloride–ethyl vinyl acetate blends using coincidence Doppler broadening spectroscopy

“…By measuring the electron momentum changes at the location of the annihilation process, the chemical changes of this location can be studied. Generally, S and W line shape parameters, which describe the width of the annihilation spectrum, are used to obtain qualitative information about the electronic structure of solids 5 . As shown in Figure 1, parameters S and W are respectively defined as the ratio of the area of the central part of the spectrum (small linear momentum) and the ratio of the area of the areas with high momentum (tail of the spectrum or areas far from the center of the spectrum) to the total area of the CDBS spectrum 6 .…”

“…Generally, S and W line shape parameters, which describe the width of the annihilation spectrum, are used to obtain qualitative information about the electronic structure of solids. 5 As shown in Figure 1, parameters S and W are respectively defined as the ratio of the area of the central part of the spectrum (small linear momentum) and the ratio of the area of the areas with high momentum (tail of the spectrum or areas far from the center of the spectrum) to the total area of the CDBS spectrum. 6 Another method of CDBS spectrum analysis is to consider spectral data in the form of normalized count ratio in each channel to their corresponding number in the reference sample spectrum.…”