ELECTRONIC RELAXATION OF ACRIDINE AS STUDIED BY PICOSECOND SPECTROSCOPY
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Internal conversion (IC) and intersystem crossing (ISC) rates of the lowest excited singlet state (S1) of acridine have been measured in n-hexane at room temperature by picosecond spectroscopy. The rates deduced from the buildup of triplet-triplet absorption and the quantum yield of intersystem crossing were found to be 3 1010sec-1for the internal conversion and 3 1010sec-1for the intersystem crossing. Corresponding rates for perdeuterated acridine are found to be similar. These rates, when combined with the upper limit of the unobserved fluorescence, lead to the n* assignment of the lowest excited singlet state. The kinetics of repopulation of the ground state following a pulsed excitation of the sample give strong indication of the occurrence of S1S0internal conversion. Copyright 1977 American Institute of Physics.
