Work Group Prof. Dr. F. Temps

Fluorescence up-conversion

Femtosecond Fluorescence Up-Conversion (FLUpCon) spectroscopy is indispensible for the elucidation of complex ultrafast photophysical and photochemical transformations because of its direct sensitivity to the lifetime of the optically bright photo-excited state(s) reached in an experiment. Thanks to meticulous suppression of scattered light, our FLUpCon setup is unusually sensitive. It is also our easiest-to-operate femtosecond experiment. It can in fact readily be operated by a student for her/his  Bachelor Thesis. 

  

fs Fluorescence Up-Conversion
  
Schematic experimental setup for femtosecond fluorescence up-conversion.  (c) F. Temps

  

For molecules showing pronounced spectro-temporal evolution of the fluorescence, due to change of Franck-Condon overlap, molecular structure, or solvation dynamics, we also operate a Kerr-gated broadband fluorescence spectrometer.

Important papers:

  • J. Bahrenburg, F. Renth, F. Plamper, W. Richtering, F. Temps, "Femtosecond Spectroscopy Reveals Huge Differences in the Photoisomerization Dynamics of Azobenzenes Linked to Polymers and Azobenzenes in Solution," Phys. Chem. Chem. Phys.16, 11549 - 11554 (2014).  DOI: 10.1039/C4CP01196A 
  • N. K. Schwalb, F. Temps, "A Modified Four-State Model for the 'Dual Fluorescence' of N6,N6-Dimethyladenine derived from Femtosecond Fluorescence Spectroscopy", J. Phys. Chem. A 113, 13113 – 13123 (2009).  DOI: 10.1021/jp9021773 
  • T. Pancur, N. K. Schwalb, F. Renth, F. Temps, "Femtosecond Fluorescence Up-Conversion Spectroscopy of Adenine and Adenosine: Experimental Evidence for the πσ* State?" Chem. Phys. 313, 199 - 212 (2005).