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
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.
XMCD of Metal Clusters in the Gas Phase
By applying x-ray magnetic circular dichroism spectroscopy on mass-selected cluster ions in an ion trap, we can investigate the cluster size-dependence of their magnetic properties. While in the ion trap, the ions are cooled down to temperatures as low as 8K and magnetized by the magnetic field of up to 5T generated by the solenoid.
Recent Publication: Large orbital magnetic moments of small, free cobalt cluster ions Con+ with n ≤ 9 https://doi.org/10.1088/1361-648X/aae54a