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SUMMARY:Coherent two-dimensional spectroscopy: from photochemistry to exci
 ton dynamics
DTSTART:20150319T160000
DTEND:20150319T170000
DTSTAMP:20260407T065936Z
UID:c9e47727270e1847bab3ad16929bef424bac4cd3d7218f51275516af
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Cristina Consani\nUniversität Würzburg\, Germany\nUnderst
 anding photophysical and photochemical processes in complex molecular syst
 ems requires the capability of observing energy relaxation and disentangli
 ng different reaction pathways with high temporal and spectral resolution.
  Nonlinear ultrafast spectroscopies\, among them coherent two-dimensional 
 spectroscopy\, are particularly suited for this purpose. These techniques 
 allow investigating processes ranging from ultrafast isomerization to exci
 ton dynamics in multicenter chromophores\, as I will illustrate on differe
 nt examples.\nOne example regards the dynamics of energy relaxation and tr
 ansfer in polymeric compounds\, a topic of wide interest for optoelectroni
 cs and photovoltaics. Especially the relationship between exciton dynamics
  and structure is a key parameter which is currently poorly understood. As
  a paradigmatic example\, I will present a study on the polymer MEH-PPV (p
 oly-[2-methoxy-5-(2‘-ethylhexyloxy)-1\,4-phenylenevinylene])\, where a d
 isorder-order phase transition can be induced by lowering the temperature 
 below a critical value. With a combination of spectroscopic techniques\, a
 mong them coherent two-dimensional spectroscopy\, we characterize the inte
 rplay between the disordered and ordered phase of MEH-PPV\, as well as exc
 iton dynamics in the low-temperature ordered phase\, and we differentiate 
 between two regimes of exciton relaxation.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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