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laboratory notes
A rigid highly symmetrical rectangular frame (physical symmetry mmm) can carry two goniometer heads coaxially, but opposed apex to apex; the frame itself is axially reversible. Used with monochromated synchrotron radiation, it permits quick inversion of crystal orientations by 180° rotations about the diffraction vector, as is required for comparison of lattice parameters in different parts of a single-crystal or between two separate crystals.
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