AI Article Synopsis
- The study examines how intramolecular vibrational energy redistribution (IVR) affects dynamic processes in 2,4-difluoroanisole, focusing on restricted and dissipative IVR using advanced spectroscopy techniques.
- Restricted IVR occurs at a lower vibrational level (219 cm-1) while dissipative IVR occurs at a higher level (1200 cm-1), with lifetimes measured at 90 ps and 11 ps, respectively.
- Following excitation, the population experiences IVR, transitions into a triplet state through intersystem crossing in about 400 ps, and then undergoes slower nonradiative relaxation over the nanosecond timescale.
Article Abstract
Intramolecular vibrational energy redistribution (IVR) has a profound impact on dynamic processes. We have studied two types of IVR processes, restricted and dissipative, and ultrafast dynamics of the S1 state of 2,4-difluoroanisole using time-resolved photoelectron spectroscopy and time-of-flight mass spectroscopy. The restricted IVR occurs in the intermediate regime of 219 cm-1 vibrational level, and the dissipative IVR occurs in the statistical regime of 1200 cm-1. The lifetimes of IVR processes are measured to be 90 and 11 ps, respectively, depending on the internal energies of the S1 state and differ by a factor of eight. Similar subsequent dynamics were observed at two vibrational levels in the S1 state. The population undergoes IVR following the initial excitation and subsequently leaks into a triplet state, accompanied by intersystem crossing within ∼400 ps followed by a slower nonradiative relaxation of the triplet state on the nanosecond time scale. Furthermore, the values of 3s and 3px Rydberg states of 2,4-difluoroanisole were experimentally determined to be 5.02 and 6.28 eV.
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| http://dx.doi.org/10.1063/5.0231264 | DOI Listing |
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