Abstract
This chapter discusses the time correlated single photon counting (TCSPC) technique, which is widely used in methods for time resolved emission measurements in nano- and subnano-second-time domains. This is important in the field of organic photochemistry, as most of the organic chromophores have the lifetime of the excited singlet state of a few nanoseconds. The measurements of emission decay profiles are used to monitor the excited state population in various photochemical reactions. The principles underlying TCSPC can be studied in detail with the aid of corresponding time diagrams. The excitation sources are discussed. The TCSPC method does not require a strong excitation light source. The comparison of main TCSPC characteristics of a microchannel plate photomultiplier tube and an avalanche photodiode are discussed. The chapter highlights detection subsystems, which include emission detectors, electronics, and the more advanced electronic modules for TCSPC measurements. Measurements and data analysis are covered with the commercial instruments and their components.
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