Hybrid forms of beat phenomena in nuclear forward scattering of synchrotron radiation

In nuclear forward scattering (NFS) of synchrotron radiation, inter-resonan ce interference leads to a quantum beat (QB), and intra-resonance interfere nce to a dynamical beat (DB). In general both interference processes determ ine the time evolution of NFS. Only in the case of far distant resonances t he resulting interference pattern can be interpreted as a well distinguisha ble combination of QB and DB. Multiple scattering by near neighbouring reso nances, by contrast, leads to a hybridisation of QB and DB. In particular, asymmetrical continuous distributions of resonances make QB and DB blend in to a fast hybrid beat with thickness dependent period and distribution sens itive modulation.