Add time:08/16/2019         Source:sciencedirect.com

Ultrafast relaxation dynamics of n-propylbenzene (n-PB) cation were studied by delayed photofragmentation and photoelectron spectroscopy. Multiphoton ionization (MPI) by the fundamental pulse at ∼800 nm was used to prepare the n-PB cations. The photoelectron image for MPI was captured and characterized by the photoelectron imaging technique, and the observed photoelectron bands were assigned to the corresponding cationic states. The ultrafast relaxation dynamics of these cation states were tracked by monitoring the time-dependent parent-ion (C6H5C3H7+) depletion and the fragment-ion (C6H5CH2+) appearance. An ultrafast relaxation time of 1.1 (±0.1) ps for the cations was obtained, which was ascribed to a dissipative intramolecular vibrational redistribution process within the ground D0 state.

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