Cryogenic Ion Trap

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