2026-03-08T21:37:52Z https://hiroshima.repo.nii.ac.jp/oai

oai:hiroshima.repo.nii.ac.jp:02008702 2025-02-22T04:08:05Z 1730444907710

Relaxation dynamics of NH stretching vibrations of 2-aminopyridine and its dimer in a supersonic beam Yamada, Yuji Yamada Yuji Mikami, Naohiko Mikami Naohiko Ebata, Takayuki Ebata Takayuki open access Copyright (c) 2008 by The National Academy of Sciences of the USA 430 Picosecond time-resolved IR-UV pump-probe spectroscopy has been carried out in order to elucidate vibrational energy relaxation (VER) of the NH stretching vibrations of 2-aminopyridine monomer (2AP) and dimer ((2AP)2) in supersonic beams. In bare 2AP, intramolecular vibrational energy redistribution (IVR) of the NH vibrations is described by the two bath mode model, where the initial vibrational energy flows to the doorway states rapidly (6.5 ps) and then dissipates into the dense bath states with a time constant of ~20 ps. No clear difference was observed in the IVR lifetime between the symmetric and asymmetric NH2 stretch modes. In (2AP)2, IVR and vibrational predissociation (VP) were involved in VER. It was found that the rate constants of both IVR and VP of the hydrogen-bonded NH stretching vibration are larger than those of the free NH. National Academy of Sciences 2008 eng journal article AO https://hiroshima.repo.nii.ac.jp/records/2008702 10.1073/pnas.0800354105 http://dx.doi.org/10.1073/pnas.0800354105 0027-8424 AA10808769 Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences of the United States of America 105 35 12690 12690 12695 https://hiroshima.repo.nii.ac.jp/record/2008702/files/ProcNatlAcadSciUSA_105_12690.pdf 491.0 KB