A Sensitive Multichannel Detection System for Surface Raman Spectroscopy

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Abstract
A cooled multichannel detector has been developed that is based on a second-generation image intensifier tube and a Reticon photodiode array. The sensitivity of the device is characterized and discussed in terms of the limiting noise sources. For use in Raman spectroscopy, the detector has been optically matched to a triple spectrograph. Signal-to-noise ratios obtained with this detection system are compared with those of typical photon counting instruments. The required integration time (∼1000 s) and substrate properties to record unenhanced Raman signals from an adsorbed molecular monolayer on a surface are discussed.