Hannover 2016 – scientific programme
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MO: Fachverband Molekülphysik
MO 20: Femtosecond Spectroscopy 4
MO 20.6: Talk
Friday, March 4, 2016, 12:15–12:30, f102
Ultrafast vibrational dynamics of solvated protons — •Fabian Dahms, Rene Costard, Erik T. J. Nibbering, and Thomas Elsaesser — Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Str. 2a, 12489 Berlin, Germany
Over the past decades, the nature of the hydrated proton has been subject of intense study. The key roles of hydrated protons in aqueous proton transport (known as the von Grotthus mechanism), in aqueous acid-base chemistry and in proton pump membrane proteins are indisputable, yet the interconverting mechanisms and related structures such as Zundel and Eigen cations have remained elusive. With one and two color mid-infrared pump-probe spectroscopy in a range from 1500 cm−1 up to 3700 cm−1, we determine the absorption bands’ nature and the intrinsic vibrational lifetimes of Zundel cations on a femtosecond time scale. The extensive experimental results allow for following the energy flow and redistribution after vibrational excitation. Moreover, we gain new information about the origin of the broad Zundel absorption continuum.