Femtosecond/picosecond laser system:

We use a custom Coherent Inc. laser system to produce broadly tunable (200-2500nm) femtosecond/ picosecond pulses. Harmonic generation and sum frequency mixing of the OPA output provides the desired wavelengths for the pump process, whereas 4^th harmonic generation of the Ti:Sa fundamental supplies a 200nm probe photon. Our beam diagnostics include a single shot autocorrelator for 800nm and a scanning crosscorrelator for UV pulses integrated into our 4^th harmonic box set up.

 

 

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Magnetic bottle-type photoelectron photoion coincidence spectrometer:

The two time-delayed laser pulses interact with a skimmed molecular beam (sample vaporized by heating or laser ablation) in the ionization region of the PEPICO spectrometer. The photoelectron spectrometer uses a magnetic ‘bottle’ for high collection efficiency of photoelectrons and ion detection based on a Wiley-McLaren TOF mass spectrometer.

 

Molecular beam sources:

Until now, only a few gas-phase spectroscopic studies have been dedicated to small biomolecular building blocks, reflecting the difficulty of vaporizing them in detectable quantities. Low volatility and thermal decomposition of many biomolecules, make it necessary to employ advanced molecular beam techniques, such as laser ablations.

 

Department of Physics and Astronomy

Ullrich Group