Observation of Proton Transfer in 2-Aminopyridine Dimer by Electron and Mass Spectroscopy

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• 作者：Elena Samoylova ; Wolfgang Radloff ; Hans-Hermann Ritze ; Thomas Schultz
• 刊名：Journal of Physical Chemistry A
• 出版年：2009
• 出版时间：July 23, 2009
• 年：2009
• 卷：113
• 期：29
• 页码：8195-8201
• 全文大小：242K
• 年卷期：v.113,no.29(July 23, 2009)
• ISSN：1520-5215

文摘

A photoinitiated intermolecular electron−proton transfer reaction in 2-aminopyridine dimer was investigated by femtosecond pump−probe electron−ion coincidence spectroscopy and accompanying theory. Excited-state population dynamics were observed in real time by time-resolved mass spectroscopy, and the respective excited-state character of locally excited and proton/hydrogen transfer states was identified in coincident electron spectra. Two reaction channels for an ultrafast (sub-50 fs) and a slower (75 ps) proton/hydrogen transfer were observed and indicate that vibrational energy redistribution may lead to efficient population trapping in the excited state. Spectroscopic evidence of an unexpected hydrogen-transfer reaction in photoexcited aminopyridine monomer is also presented.