NRS entry

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    Nuclear Resonant Scattering (NRS) is an experimental technique to investigate the energetic levels of atoms. Its resolution allows to distinguish between hyperfinelevels.

    First, charged particles are accelerated to relativistic speeds in circular accelerators, causing them to emit synchrotron radiation. This energetically broad (as opposed to sharp energy distributions in Mössbauer spectroscopy etc.), pulsed radiation is used to irradiate the sample. The radiation interacts with the sample, with scattering processes, i.e. absoprtion and reemmission by atoms jumping between hyperfine levels, on the timescale of 10E-6 to 10E-9 s. After the interaction, the time-dependent intensity behind the sample is measured by a detector. This time-dependent intensity is a result of the superposition of several emitted radiations of slightly different frequencies, leading to ‘quantum beats’. These are recorded and Fourier transformed to interpret the data.

    NRS allows one to map the hyperfine levels of a sample by studying the emission spectrum (derived by Fourier transforming the intensity).

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