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User station 9: Molecular beam instrument for cluster spectroscopy

This experimental instrument enables the spectroscopic characterization of transition metal clusters and their interactions with simple ligands as molecular level model systems for heterogeneous catalytic processes. Transition metal clusters (typically 3 to 50 atoms) are produced in a molecular beam with a home built Smalley-type laser ablation source and can either be studied themselves, or  complexed with ligands in a flow-tube type reaction channel. The clusters or cluster-ligand complexes interact with one macropulse of FELIX, and are detected using time-of-flight mass spectrometry.

  • Metal cluster source
  • Metal targets: 8 mm or smaller diameter rod
  • Ligands: gas or vapour

Detection lasers

  • ns pulsed dye lasers (205-720 nm)
  • ArF excimer laser (193 nm)
  • F2 excimer laser (157 nm)

Spectroscopic techniques

  • IR- multiple photon dissociation spectroscopy
  • IR-UV double-resonance spectroscopy

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Molecular beam instrument for cluster spectroscopy

Differentially pumped vacuum chamber and an interaction chamber, where the molecular beams interact with the FELIX lasers.