In this paper we present our investigations on the first step of the optically induced multistep electron transfer in squarilic systems, i.e. we show the evolution of the transient intramolecular charge transfer state on a fs-timescale. For the chosen pump-and-probe setup a mode-locked Ti-sapphire laser in combination with a regenerative amplifier provides the used 100 fs-laserpulses. As probe light we use white light which is generated in a thin sapphire plate and which allows us to measure the excited state absorption in a wide spectral range (240 nm) simultaneously. When exciting the squaraine molecule with the frequency-doubled laser light at 400 nm, the local charge densities inside the squaraine vary. It can be noticed that an intramolecular electron transfer from the nitrogen towards the squaric acid has taken place.
Fs-pump-and-probe spectroscopy on squaraine dyes
2005-01-01
150661 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Unsymmetrical Squaraine Dyes for Nonlinear Optics
Online Contents | 1997
Cavity-Enhanced Spectroscopy Using Pump-Probe Differencing
British Library Conference Proceedings | 2005
|