Nuclear Resonant Scattering (NRS)

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    Resonant scattering is a form of scattering in which the incoming scattering frequency
    remains the same after the scatter proces. This means that a particle in a certain
    energy state will absorb the photon and emit it with the same energy. Nuclear
    resonant scattering means that this proces is done with nuclei. Due to the natural
    linewidth of the energy levels and various other broadening evenent, this is
    quite hard to achieve. Since synchrotron radiation exists in the range from
    infra-red to x-rays, it can be used to measure lots of propreties of materials.
    One of the main investigation field is the spin structure of materials in surface
    layers, but also deeper layers. This because the transitions are depending on a change
    in spin of the nucleus, with other words a change in nuclear magnetic moment.

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