- D. Fluorescence Spectroscopy
Steady-state fluorescence spectra can be obtained with a PTI Model C60 Steady-State Spectrofluorometer using a xenon arc lamp source and a photomultiplier detection system. A PTI Model C-72 Fluorescence Lifetime Spectrometer using a PTI GL-3300 Nitrogen Laser and a GL-302 Tunable Dye Laser can be used to detect fluorescence lifetimes with nanosecond time resolution. Fluorescence decay data can be analyzed with a program written in-house. The program performs a Levenberg-Marquardt analysis to determine the multiexponential contributions of the luminescence rise and decay of each component. The emission is detected using a switcheable analog/photon counting photomultiplier.
For routine measurements, we have a Shimadzu RF-5301 PC spectrofluorimeter operating in the wavelength region between 220 and 750 nm.
- Short excited-state lifetimes can also be measured by use of the Ti:Sapphire OPA pump-probe system by using the probe pulse to stimulate the fluorescence of the excited state. By measuring the intensity of the stimulated emission as a function of delay time between the pump and probe laser pulses, decay times of very short lived excited states can be determined.
- Short excited-state lifetimes can also be measured by use of the Ti:Sapphire OPA pump-probe system by using the probe pulse to stimulate the fluorescence of the excited state. By measuring the intensity of the stimulated emission as a function of delay time between the pump and probe laser pulses, decay times of very short lived excited states can be determined.
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