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Optical activity in the X‐ray range stems from the electric‐dipole–electric‐quadrupole interference terms mixing multipoles of opposite parity, and can be observed exclusively in systems with broken inversion symmetry. The gyration tensor formalism is used to describe the X‐ray optical activity in langasite La3Ga5SiO14 crystal with the P321 space group. An experimental study of the X‐ray natural circular...
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