Abstract
Resonant pulse propagation (RPP) is reviewed with special emphasis on the propagation of synchrotron radiation (SR) pulses through nuclear single-resonance media. The most remarkable feature in the time evolution of RPP is the dynamical beat (DB), a pronounced modulation with periods increasing with time and decreasing with increasing sample thickness. A comparison of RPP at α-wavelengths (SR and Mossbauer radiation) with RPP in the infrared and visible regimes in case of molecular, atomic and excitonic resonances reveals an astonishing universality of the observed phenomena. The DB is described within the double-hump picture and the group-velocity picture, and is finally attributed to the energy exchange between radiation field and oscillator system in multiple scattering.
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