The Ion Trap is designed for x-ray magnetic circular dichroism (XMCD) spectroscopy of cold gaseous ions in a magnetic field of up to 5 T. Size-selected cluster ions, molecular ions, and ionic complexes can be studies using a unique cryogenic linear quadrupole ion trap with 5 T superconducting solenoid. The radio-frequency ion trap is operated in the space-charge limit for high signal-to-noise ratio. Magnetron sputtering and gas aggregation is the standard ion source, but other ion sources can be added as well.Selected Applications:
- Magnetic moment characterization of free ions
- Controlled radiation damage in organic ions via photofragmentation
- Electron correlation in highly excited states of simple molecules
NEXAFS, XMCD, Mass Spectrometry
|Energy range||120 - 1600 eV|
|Energy resolution||> 10000 at 400 eV|
|Focus size (hor. x vert.)||beam profile 0.6 x 0.7 mm (at 200 micron exit slit)|
|Phone||+49 30 8062 12137|
|More details||UE52_PGM Ion trap|
|Temperature range||3 - 300 K|
|Pressure range||For details contact the scientist in charge.|
|Detector||high transmission reflectron time-of-flight mass spectrometer for ion yield spectroscopy|
|Manipulators||cryogenic linear quadrupole ion trap|
|Sample holder compatibility||For details contact the scientist in charge.|
We offer a unique cryogenic linear quadrupole ion trap with 5 T superconducting solenoid for x-ray magnetic circular dichroism (XMCD) spectroscopy of size-selected cluster ions, molecular ions, and ionic complexes. The radio-frequency ion trap is operated in the space-charge limit for high signal-to-noise ratio. Magnetron sputtering and gas aggregation is the standard ion source, but other ion sources can be added as well.
Because of its complexity, this experimental setup requires thorough consultation with the scientist in charge. Please contact us well ahead of time to discuss experimental feasibility. This is currently the only instrument world-wide that allows performing XMCD studies of cold gas-phase ions.
- metal ion source (single/dual target magnetron sputtering and gas aggregation with additional reactive gas port)
- hexapole collision/reaction cell for preparation of ionic complexes and oxides
- quadrupole mass filter for monodisperse ion beams
- cryogenic ion trap (liquid-helium-cooled) with ion temperatures down to 7.4 K
- buffer gas cooling for Zeeman relaxation
- applied homogeneous magnetic field (0 - 5 T) coaxial with ion trap axis
- reflectron time-of-flight mass spectrometer for partial ion yield detection of x-ray absorption and XMCD spectra
Further ion sources (e.g. electrospray ionization) can be made available upon request.
See here for details of beamline UE52-PGM.
Ion Trap is jointly developed and operated by Helmholtz-Zentrum Berlin, Universität Freiburg, TU Berlin, Kyushu University, and Toyota Technological Institute.
Ion Trap and its ongoing upgrade program are partially funded by the German Federal Ministry for Education and Research (BMBF) under Grant No. BMBF-05K13VF2 and No. BMBF-05K16VF1.