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Excited-state decay kinetics of 4-CI in isopropanol, measured at 2205 cm−1. The smooth line represents the best fit of these data to a function consisting of an exponential decay component with a lifetime of 1.6 ± 0.2 ps and a damped oscillatory component with an exponential damping time constant of 0.5 ± 0.1 ps and a period of 1.9 ± 0.2 ps.
