Wikipedia NRS

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Nuclear Resonant Scattering (NRS) is an experimental method in material research. With NRS one can perform spectroscopy but by looking at the time domain of light pulses instead of the energy domain like the Mössbauer spectroscopy. As coherent light falls onto an atom (or crystal), all the hyperfine resonances get excited at the same time. As these states decay, the emitted light will interfere with each other and this will lead to several light pulses over a certain amount of time. If one takes the Fourier transform of these time pulses, one can get information about the energy of the hyperfine levels of an atom.

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