Resonantly Enhanced Difference-Frequency Generation in the Core X-ray Absorption of Molecules.

We can hence envisage extensive potential applications of the nonlinear X-ray re-DFG effect that we describe, which include, in general, the local and selective manipulation of atoms and molecules in bulk matter, and, in particular, in medicine, it might be significant for local and selective cancellation of the active center of biomolecules. 28 − 30 Acknowledgments We gratefully acknowledge Ministerio de Economía y Competitividad (FIS2017-85526-R).

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