Femtosecond broadband pump-probe

A detailed description of experimental setup of the femtosecond broadband pump-probe spectroscopy was given in Ref [11, 16]. Schematic representation of the experimental setup is shown in Figure 11.3. The combination of femtosecond broadband pump-probe spectroscopy, with an expanded spectral range, and picosecond fluorescence decay measurements permitted more detailed analysis of electron transfer dynamics [17-19]. The authors disentangled the various kinetic... 

The mechanism and dynamics of photoinduced charge separation and charge recombination have been investigated in synthetic DNA hairpins possessing donor and acceptor stilbenes (stilbene-4,4 -dicarboxylic acid, bis(3-hydroxypropyl)amide of stilbene-4,4 -dicarboxylic acid, bis(2-hydroxyethyl)stilbene 4,4 -diether) (Figure 11.1) using femtosecond broadband pump-probe spectroscopy, nanosecond transient absorption spectroscopy, and picosecond fluorescence decay measurements [11]. Nanosecond time-resolved spectra of stilbenes attached to DNA are shown in Figure 11.4. 

We performed femtosecond infrared pump-probe experiments, using pulses with a bandwidth of 200 cm"1 (FWHM). A small fraction of the infrared pulses was split off to obtain a broadband probe pulse, which was spectrally dispersed after interaction with the... 

Abstract. We present a novel instrument combining femtosecond pump-probe spectroscopy with broadband detection and confocal microscopy. The system has 200-fs temporal resolution and 300-nm spatial resolution. We apply the instrument to map excited state dynamics in thin films of polyfluorene-polymethylethacrylate blends. 

Two main techniques are available to perform 2D-IRS, namely a pulsed-Jrequency-domain technique [88] and a time-domain-pulsed-Fourier transform technique [89]. A hybrid method using acousto-optic modulation has also been proposed recently [90]. In the pulsed-frequency-domain experiments, an intense broadband femtosecond pulse is split into a pump pulse, which passes a filter to reduce the band width to sections of typically 10 cm, and an unfiltered probe pulse. Both pulses are focused into the sample within an adjustable time delay. The probe pulse (full bandwidth) measures the spectral changes of the sample after the arrival of the pump pulse. For this purpose, the intensity of the probe light beam is recorded using a spectrometer equipped with a broadband array detector. 

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