Abstract
AbstractWe have constructed two types of picosecond time‐resolved Raman spectrometers with near‐infrared excitation. One system is based on a step‐scan Fourier transform (FT) interferometer equipped with a Ge detector, and the other system is based on a dispersive spectrometer equipped with an InGaAs array detector. For the former system with pulsed Raman excitation, we have developed a new method of signal processing. This method does not require synchronization among laser pulses for Raman excitation, the stepping of the step‐scan interferometer, and the sampling of the analog‐to‐digital converter. In spite of large fluctuation in the probe‐pulse energy, the ordinary FT‐Raman spectra of samples in the ground electronic state can be obtained with satisfactory signal‐to‐noise ratios by the former system. By the latter system, picosecond transient Raman spectra have been obtained from the first excited singlet (S1) state of 9‐phenylanthracene and the second excited singlet (S2) state of all‐trans‐β‐carotene by using 388‐nm light for photoexcitation and 1064‐nm light for Raman excitation. Copyright © 2006 John Wiley & Sons, Ltd.
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