Peak Pairs Analysis (PPA) is a DigitalMicrograph plug-in based on the procedure developed by Pedro L. Galindo of University of Cadiz.
PPA offers peak intensity analysis and local strain map calculation from standard HREM images.
PPA is a complementary plug-in to GPA (Geometrical Phase Analysis) for another strain measurement plug-in.

Distortion Analysis v4.0
From the peak-pairs information and the peak positions of a complex structure, you can analyze a peak distance and angle (a length and angle of the peak-pair vector). Furthermore, in principle, you can calculate a rotation of a structural unit (e.g. tetrahedron or octahedron), or even a distance from the ideal/virtual position to the observed peak for electric dipole analysis. However, such an advanced analysis requires some skill in programing. The Distortion Analysis of the PPA will provide basic script functions to perform such an analysis using the DigitalMicrograph. Please have a look at the Distortion Analysis section of the manual.



References and Technical Notes (*Basic Readings)

Examples (Sample Data)


You have to purchase a license (hardware key) to run this program.
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Required plug-ins.

User Key Driver

Previous versions


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