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Fluorescence Links Fluorescence Home FluoroLog-3 FluoroMax-3 SkinSkan Spex 3D Tau Lifetime Software Accessories Technical Notes Applications Plate Reader Signal / Noise Macro Scanning PL/PLE Quantum Yields Downloads Tau-3 Brochure (pdf) Tell me More Request Product Information Why do I need a Lifetime Spectrofluorometer? Time is Always on your side once your laboratory is equipped with a Spex Tau Lifetime Spectrofluorometer. Instantly, Tau delivers the best of both worlds: steady-state and dynamic measurements with just the twist of a knob. You get TRUE picosecond performance for far less expenditure than any other picosecond system. Why frequency domain? Measurements are backed up by over a century of research and experience Uses a reference to monitor the modulation of the excitation beam while also measuring the emission, so true differential measurement is performed. Produces two observables - phase and modulation - for determining the lifetime. Usually faster, easier, and requires less maintenance. Can be performed with a source that has a continuous output compatible with steady-state measurements. Therefore, a dual-purpose instrument can be manufactured with the same light source for both. The differential measurements cancel out instrument artifacts such as pulse-smearing through monochromators, that limit the usefulness of time-domain measurements. Only the Tau delivers: Highest sensitivity-even with a xenon source (cw laser optional) Flexibility with sources-no expensive pulse lasers are needed Flattest frequency response over the full frequency range Fast selection of lifetime or steady-state operation Upgrades for any FluoroLog-3 to lifetime capability In the frequency domain, the excitation source has its intensity modulated at a high frequency. As a result, the sample's emission is also modulated, but out of phase with the excitation. Both the phase-difference and the modulation of the emission are directly linked to lifetime. Tau applications: Lifetime Heterogeneity Distributed Fluorescence Decays Anisotropy Decays Single and multi-component fluorescence decays Resolve picosecond lifetimes Deconvolve multiple spectra Watch the time-evolution of spectra Record time-resolved polarisation spectra

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