Techniques for inelastic X-ray scattering with mu eV-resolution

A new spectroscopic technique is introduced that allows tuning of a mu eV-w ide beam of synchrotron radiation over a range of a few meV. It relies on n uclear resonant scattering that is subject to the Doppler effect in high sp eed rotary motion. Two mechanisms are discussed how to extract the resonant ly scattered radiation out of the broad band of synchrotron radiation: (a) grazing incidence reflection from a rotating disk in combination with a pol arization filtering technique and (b) deflection of resonantly scattered ra dition via the recently discovered Nuclear Lighthouse Effect. Implications for inelastic X-ray scattering and elastic nuclear resonant scattering are discussed.