Abstract
In this chapter, time-resolved study on the vibrational energy relaxation (VER) of gas-phase aromatic molecules and their clusters cooled in supersonic jets are described. The experiment is performed by picosecond IR-UV pump-probe spectroscopy, where the molecules are excited to a specific vibrational level of the electronic ground state (S0) by a picosecond IR pulse laser, and the time evolution of the excited level as well as the energy transferred levels are monitored by a picosecond UV pule laser. In the molecule in isolated condition, VER involves intramolecular vibrational energy redistribution (IVR), and in the cluster IVR is followed by vibrational predissociation (VP), if the initial vibrational energy is larger than the binding energy of the cluster. We focus VER of high frequency vibrations; OH, NH and CH stretching vibrations. Among these vibrations, OH and NH starching vibrations are localized motion, while the CH stretching vibration is the collective motion of several CH groups. The molecules studied in this chapter is phenol, aniline, 2-aminopyridine and benzene. We will see how the difference of the vibrational motion affects the IVR process and its speed in these molecules. We also investigate the IVR and VP of the H-bonded clusters and van der Waals clusters. We discuss the route of the energy flow starting from the IR excited vibration to other vibrational levels within the molecules and clusters and the time scales.
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Ebata, T. (2019). Time-Resolved Study on Vibrational Energy Relaxation of Aromatic Molecules and Their Clusters in the Gas Phase. In: Ebata, T., Fujii, M. (eds) Physical Chemistry of Cold Gas-Phase Functional Molecules and Clusters. Springer, Singapore. https://doi.org/10.1007/978-981-13-9371-6_9
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