title: On the origin of high transient anisotropies: an exemplification in a Cd-porphyrin.
abstract: Transient anisotropy is a widely used spectroscopic method to access the polarization dynamics of a molecular sample. In this contribution, we present results on 5,10,15,20-tetraphenyl-porphyrinato cadmium (II) in tetrahydrofuran which exhibits values exceeding the typical range between 0.4 and -0.2 in dependence of the probe wavelength. These findings are explained by varying contributions from excited state absorption and ground state bleaching∕stimulated emission. Model calculations show that time zero values and time decays are complex values that often do not correlate with the underlying physical processes. As a consequence, the interpretation of anisotropy experiments necessitates extreme care.
authors: Karlsruhe Institute of Technology, Institute for Physical Chemistry and Center for Functional Nanostructures, 76128 Karlsruhe, Germany.
authors: Yu
authors: Y
authors: Liang
authors: Karlsruhe Institute of Technology, Institute for Physical Chemistry and Center for Functional Nanostructures, 76128 Karlsruhe, Germany.
authors: Melanie
authors: M
authors: Klinger
authors: Department of Chemical Physics, AlbaNova University Center, Stockholm University, Roslagstullsbacken 21, 109 61 Stockholm, Sweden.
authors: Oliver
authors: O
authors: Schalk
authors: Karlsruhe Institute of Technology, Institute for Physical Chemistry and Center for Functional Nanostructures, 76128 Karlsruhe, Germany.
authors: Andreas-Neil
authors: AN
authors: Unterreiner