| In x-ray science, cross sections for x-ray absorption in matter are typically assumed to be invariants, depending only on the atomic and spatial composition of the material. However, by utilizing strong laser pulses, it is possible to modify x-ray absorption cross sections in a controlled way. Gas-phase systems are particularly suitable for illustrating the basic principles underlying combined x-ray and laser interactions. Phenomena that will be discussed include electromagnetically induced transparency for x rays and x-ray processes involving laser-aligned molecules. |
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