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In Part I, which appeared in last month's issue, the theoretical aspects of diode array UV-VIS spectroscopy were discussed. The second article in this two-part series describes the applications of diode arrays in analytical chemistry.Applications of the linear photodiode array (LPDA) spectrometer in the UV-VIS spectral region can be considered under four headings: (1) molecular spectroscopy, (2) rapidscanning detection for time-dependent phenomena, (3) rapid-scanning detection in HPLC, and (4) other ap-plications, which include low-lightlevel applications and atomic spectroscopy. SpectroelectrochemistryThe combination of electrochemistry and spectroscopy was first reported in 1964 (1). Since that time spectroelectrochemistry has been used to study the redox chemistry of inorganic, organic, and complex biological molecules. The redox reactions in these systems occur on the second to millisecond time scale. Consequently, the ability of the LPDA spectrometer to measure spectra on a millisecond time scale is important. Although Raman, fluorescence, and internaland specular-reflectance spectroscopy have been used in spectroelectroche-