Diode-array spectrometer (DAPS) for visible and near-IR absorption measurements with 10-ns time resolution

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Abstract
This paper describes a diode-array pulsed spectrometer (DAPS) that performs flash photolysis studies with a time resolution of 10 ns and a spectral resolution of 2.4 nm over a 600-nm wavelength window in the range of 350–1100 nm. It employs a 1024-element photodiode-array detector with high dynamic range and low noise. Laser-pumped fluorescent dye mixtures are used as a novel, stable light source which enable it to record spectra with a photolimited S/N ratio equivalent to 0.001 abs. units in a single shot. The measuring light distribution can be tailored so that a constant S/N ratio across a spectrum is attainable even in regions of high absorbance. Electrical artifacts from the actinic laser or other discharges do not interfere with the measurement and the effects of scattered actinic light and fluorescence from the sample are minimized. The instrument is simple to build, using mainly standard lab equipment, and easy to maintain and operate.

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