Abstract
Abstract We briefly review work on the nature of inhomogeneous broadening of spectral lines in doped inorganic insulating crystals, and its effect on dynamical processes. Evidence from fluorescence line-narrowing and spectral holeburning suggests that inhomogeneities act as microscopic perturbations, shifting the energy of near-neighbor dopants by an amount comparable to the overall inhomogeneous broadening. Magnetic inhomogeneities due to different nuclear spin configurations are small (≈kHz-MHz) but very important because they vary on the timescale of a spectral holeburning experiment and lead to spectral diffusion.
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