Observation of proton transfer in 2-aminopyridine dimer by electron and mass spectroscopy.
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 (approximately 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.
Samoylova
Elena
E
Max-Born-Institute, Max-Born-Str. 2A, 12489 Berlin, Germany.
Radloff
Wolfgang
W
Ritze
Hans-Hermann
HH
Schultz
Thomas
T