skip to main content

SciTech ConnectSciTech Connect

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

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:
; ;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22253803
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 139; Journal Issue: 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION; ANISOTROPY; GROUND STATES; POLARIZATION; PORPHYRINS; STIMULATED EMISSION; TETRAHYDROFURAN; TRANSIENTS; WAVELENGTHS