Examining the relaxation dynamics of indole via ionization and fragmentation pump-probe spectroscopies

Three pump-probe spectroscopic techniques are employed to investigate the involvement of the low-lying 1La and 1Lb states and the 1ps* state in the deactivation process of indole following photoexcitation in the 201-282 nm range: (1) Time-resolved photoelectron spectroscopy, (2) hydrogen atom time-resolved kinetic energy release, and (3) time-resolved ion yield. Each method provides complementary information specific to the photophysical processes in indole, and a thorough examination of the excited states in the relaxation process is afforded.