As far as I know, GPA offers very detailed strain maps. A strain map, however, provides only a relative measure of d-spacing (i.e. how the d-spacing is prolongued or shortened in a particular location compared to some average or reference d-spacing).
My question is: Does GPA provide also some absolute measure (d-spacing map instead of strain map) or does it provide only the relative measure (strain map) and the user is expected to get the reference d-spacing somewhere else (manualy from FFT, via electron or X-ray diffraction...) to obtain some absolute numbers?
Thank you.
Hi. I am trying to answer your question, just in my point of view. Based on the theory of GPA, it more useful to calculate the local distortion, since the lattice reference is the area with perfect crystal lattice in the HRTEM image. It does not give the absolute d-spacing.
Yang-Tao is right. You need an internal reference with know lattice parameters to get absolute numbers. Be aware, the number obtained from GPA depends on many factors, the selected g spots, the mark, the degree of smoothing and so on.
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