Deutsch Intern
    Research group of Ingo Fischer

    Picosecond Time-Resolved Spectroscopy

    Picosecond Spectroscopy

    Dynamics of  π-Conjugated Molecules and their Dimers

    In the center of this project are polycyclic aromatic hydrocarbons and heterocycles that are of relevance in material science. We study the processes that occur in these molecules after photoexcitation. The majority of experiments are carried out in the gas phase, but complementary studies in solution are also conducted. Beside the isolated molecules we also study their dimers to better understand energy transfer processes, excimer formation and singlet fission in aggregates. The most relevant experimental method in this project is picosecond time-resolved spectroscopy. As a new detection scheme we recently established time-resolved photoelectron spectroscopy using imaging detection of electrons to gain a deeper insight into the light-induced dynamics.

    Co-workers:  Marco Flock, Floriane Sturm

    Selected publications:

    M. Flock, L. Bosse, D. Kaiser, B. Engels, I. Fischer
    A time-resolved photoelectron imaging study on isolated tolane: observation of the biradicalic 1Au state
    Phys. Chem. Chem. Phys. 21, 13157 (2019)

    J. Hoche, H.-C. Schmitt, A. Humeniuk, I. Fischer, R. Mitric, M.I.S. Röhr
    The mechanism of excimer formation: an experimental and theoretical study on the pyrene dimer
    Phys. Chem. Chem. Phys. 19 , 25002 (2017)

    T. Gerbich, H.-C. Schmitt, I. Fischer, R. Mitric, J. Petersen
    Dynamics of Isolated 1,8-Naphthalimide and NMethyl-1,8-naphthalimide: An Experimental and Computational Study
    J. Phys. Chem. A 120, 2089 (2016)

    Femtosecond Spectroscopy

    We carry out experiments with femtosecond time resolution in cooperation with the groups of L. Poisson (CEA Saclay bei Paris) and T. Schultz (MBI Berlin). The work was partially funded by the Laserlab Europe program gefördert. Our preferred methods are time-resolved photoionisation and photoelectron spectroscopy.

    Recent publications:

    M. Margraf, B. Noller. C. Schröter, T. Schultz, I. Fischer, Time- and frequency-resolved photoionization of the C 2A2 state of the benzyl radical, C7H7, J. Chem. Phys. 133, 074304 (2010)

    J. Köhler, P. Hemberger, I. Fischer, G. Piani, L. Poisson, Ultrafast dynamics of isolated fluorenone, J. Phys. Chem. A 115, 14249 (2011)

    P. Hemberger, J. Köhler, I. Fischer, G. Piani, L. Poisson, J.M. Mestdagh, Femtosecond dynamics of cyclopropenylidene, c-C3H2, Phys. Chem. Chem. Phys., DOI:10.1039/c2cp23728h