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User station 5: Laser-desorption molecular beam set-up for bio-inspired spectroscopy (BuMa-I)

We aim at a full understanding of the structure and conformational dynamics of bio-related molecules such as peptides, supramolecular complexes and hydrogen-bonded systems. These mostly non-volatile molecular systems are brought into the gas phase via laser desorption and subsequently cooled down in a supersonic expansion, resulting in intact, cold, neutral molecules. The molecules can be probed by using conformer-selective IR-UV double resonance spectroscopy in the region from about 1900 to 80 cm-1 - the full FELIX spectral region. Detection occurs via time-of-flight in our reflector time-of-flight mass spectrometer.

Have a look at user station 5 in our virtual lab (wait a moment to load and start at the right spot).

Molecular Sources

  • Laser desorption source operating at 1064 nm, 10 Hz, 1-2 mJ
  • Heatable source (30 - 195 degrees Celcius, up to 20 Hz)
  • Discharge source (up to 20 Hz, Ar or He plasma, 0-800V, 0-500 mA)

UV lasers

  • 2x YAG pumped ns pulsed dye lasers (205-720 nm)
  • ArF excimer laser (193 nm)

Schematic layout of the molecular beam set-up. In the interaction chamber the isolated and cooled neutral molecules interact with the UV and IR beams of FELIX.

BuMa-I