Nuclear resonant scattering of x rays is an important method to probe the dynamics and structure of condensed matter. As the bandwidth of a synchrotron-radiation pulse is much broader than the linewidth of Mössbauer isotopes in a target, the resonant fraction of the incident x-ray photons is extremely tiny. This work proposes using magnetic switching to control the interference between the off-resonant background x rays and the resonant scattered signal, for enhancement of the output intensity via Fano resonance. This scheme points toward a bright, flexible x-ray source for precision spectroscopy utilizing modern synchrotrons.
Figure. Output x-ray spectrum for single (blue dashed line), 50 (red dashed-dotted-filled line), and without (black solid line) magnetic switching. Green long-dashed line depicts the theoretic maximum spectrum. Credit: Phys. Rev. Applied 18, L051001 (2022)
