TIME RESOLVED SPECTROSCOPY OF EXCITED-STATE ENERGY TRANSFER IN BIACETYL

Abstract

Time-resolved laser spectroscopy is used to identify the population of the low-lying excited-states in biacetyl and to probe the dynamics of excited-state energy transfer. A nitrogen pumped dye laser populates various excited-state vibronic levels, and a boxcar integrater follows the time decay of emission from the singlet and the subsequent time evolution of population into the triplet. From these data, a value of the intersystem crossing rate as a function of the wavelength of excitation and pressure of biacetyl is obtained.