Wavelet transform can distinguish the positions of different elements well, where the x-axis and y-axis represent the distribution of data in K space and R space respectively.
When I compare data obtained from different samples in the same batch of experiments, using the same conditions to process the EXAFS signal, what does it mean that the peaks are in the same position but with different intensities?
Dear Yang Bingqian ,
we know, that the EXAFS amplitude is among others proportional to the coordination number, i.e. the number of the nearest neighbours in specific distances.
So when the z coordinate (peak value of a peak having the same R and k values), changes in the wavelet diagram, it means, to my opinion, that the coordination number for that coordination shell has been changed accordingly up or down as the z value of that peak does.
Best regards
G.M.
z coordinate (peak value of a peak having the same R and k values), changes in the wavelet transformation represent
The position of the peaks in the wavelet transform corresponds to the frequency of the signal. In the case of EXAFS (Extended X-ray Absorption Fine Structure) data, the frequency of the signal is related to the distances between atoms in the sample. When comparing data obtained from different samples in the same batch of experiments, the position of the peaks being the same suggests that the atomic structure of the samples is similar. However, the difference in intensity of the peaks indicates that the abundance or concentration of the atoms in the samples is different. It could also be an indication of differences in the degree of disorder or variability in the atomic positions within the samples. In general, differences in the intensity of the peaks in the wavelet transform can be used to identify variations in the characteristics of the data, such as changes in the composition, structure, or morphology of the sample.
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