On the origin of high transient anisotropies: An exemplification in a Cd-porphyrin

Journal Article · Sat Dec 14 00:00:00 EST 2013 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4840415· OSTI ID:22253803

Liang, Yu; Klinger, Melanie; Unterreiner, Andreas-Neil ^[1]; Schalk, Oliver ^[2]

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1. Karlsruhe Institute of Technology, Institute for Physical Chemistry and Center for Functional Nanostructures, 76128 Karlsruhe (Germany)
2. Department of Chemical Physics, AlbaNova University Center, Stockholm University, Roslagstullsbacken 21, 109 61 Stockholm (Sweden)

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.

• OSTI ID: 22253803
• Journal Information: Journal of Chemical Physics, Vol. 139, Issue 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
ANISOTROPY
GROUND STATES
POLARIZATION
PORPHYRINS
STIMULATED EMISSION
TETRAHYDROFURAN
TRANSIENTS
WAVELENGTHS