title: Phase and modulation optical spectroscopic methods for determining triplet lifetimes and slow rotational diffusion coefficients.
mesh_terms: D004058:Diffusion; D007834:Lasers; D008163:Luminescent Measurements; D012399:Rotation; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods