Abstract
The time evolution of a two-level spin system for thermal equilibrium towards the saturated state (saturation transient) is experimentally investigated in paramagnetic samples of dilute ruby (Cr3+:Al2O3). The authors show that near an inhomogeneously broadened resonance line the transient response to a step-modulated excitation is characterised by a non-exponential shape of the time-dependent susceptibility chi (t). Moreover they report experimental evidence that the absorption and the dispersion parts of chi (t) follow dissimilar time evolutions during the saturation transient. The experimental results are compared with the transient behaviours expected on the basis of two different models of an inhomogeneous system; the authors find that a spin packet picture is suitable to account for almost all the experimental data.
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