Experiments

FM - solid state physics and physics of materials

FM.TSA - Time-Resolved Transient Absorption Spectroscopy

Time-resolved spectroscopy is a powerful tool for studying how light interacts with the matter under investigation, as well as for studying the sample itself. Depending on the light sources used, the accessible processes range from very fast electronic dynamics (femtosecond timescales), vibrational effects (femto- to picoseconds), photochemical reactions (nano- to many microseconds), to structural changes (picoseconds to microseconds). One common way to study these processes is through pump-probe experiments. In these experiments, the system is first excited with a pump pulse, and then a second probe pulse is used to measure the system's response. By adjusting the delay between the pump and probe pulses, one can probe the system at different times after excitation. This allows to observe how the system changes over time. In this lab, the excitation of the molecule Zinc Tetraphenylporphyrin (ZnTPP) will be studied using laser pulses of two different energies to measure the transient absorption (TA) in different concentrations of the molecule. The TA of mixtures of ZnTPP and fullerene (C70) in varying ratios will be evaluated to study the influence of the presence of fullerene on the decay of the excited ZnTPP*. The effect of the laser pulse characteristics on the measured signal will also be investigated.

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Languages:
D,E