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Cryogenic Ion Trap

X-ray spectroscopy and XMCD of trapped molecular, cluster, and atomic ions

Ion yield spectroscopy for XAS and XMCD of mass-selected, cold, and trapped ions

Experimental Setup

An overview of the experimental setup is shown on the left side. The apparatus can be roughly divided into four segments: cluster source, mass filter, ion trap, and time-of-flight (ToF) mass spectrometer. Each segment is housed in a differential pumping stage with the pressure decreasing from around 1mbar in the source chamber to about 10-9 mbar in the spectrometer chamber. The transmission of the ions between stages is achieved by linear multipole radio frequency (RF) ion guides and/or electrostatic ion lenses.

NEXAFS of Molecular Ions

Using an electrospray ion source together with the radio-frequency ion funnel shown on the left, we can bring coordination compounds from solution into the gas-phase for their solvent-free investigation with near-edge x-ray absorption fine structure spectroscopy.