Abstract
A linear cryogenic 16-pole wire ion trap has been developed and constructed for cryogenic ion spectroscopy at temperatures below 4 K. The trap is temperature-variable, can be operated with different buffer gases, and offers large optical access perpendicular to the ion beam direction. The housing geometry enables temperature measurement during radio frequency operation. The effective trapping potential of the wire-based radio frequency trap is described and compared to conventional multipole ion trap designs. Furthermore, time-of-flight mass spectra of multiple helium tagged protonated glycine ions that are extracted from the trap are presented, which prove very low ion temperatures and suitable conditions for sensitive spectroscopy.
Highlights
Multipole radio frequency ion traps are important for various fields of research, in particular, for ion–molecule reaction1–3 and inelastic collision4,5 studies, laser-induced reactions,6–8 ion-tagging spectroscopy,9–13 laser-induced inhibition of cluster growth,7,14 terahertz-visible two-photon spectroscopy,15–17 and ion cluster research.18,19 Multipole ion traps are used in studies of ion Coulomb crystals.20Multipole ion traps offer a large trapping volume that allows us to store a large number of ions with a range of different masses and with limited ion–ion interaction
The design of this trap is inspired by our recent room temperature octupole wire ion trap27,29 and by the cryogenic quadrupole ion trap that was designed by Jašik et al
In order to enhance optical access to the trapped ions in the sub-4 Kelvin temperature regime, we have designed a radio frequency ion trap based on wire electrodes, which is capable of reaching these low temperatures
Summary
Multipole radio frequency ion traps are important for various fields of research, in particular, for ion–molecule reaction and inelastic collision studies, laser-induced reactions, ion-tagging spectroscopy, laser-induced inhibition of cluster growth, terahertz-visible two-photon spectroscopy, and ion cluster research. Multipole ion traps are used in studies of ion Coulomb crystals.. The main goal was to design a trap that provides large optical access in the radial direction to allow very different types of radiation to be passed through the trapped ion cloud without being limited by electrodes, other obstacles, or long distances to viewports in the vacuum setup. In order to enhance optical access to the trapped ions in the sub-4 Kelvin temperature regime, we have designed a radio frequency ion trap based on wire electrodes, which is capable of reaching these low temperatures This trap provides different pre-cooled buffer-gas inlets, allows for continuous temperature measurement, and is highly adaptable to the different experimental needs. IV, the successful formation of protonated glycine ions tagged with multiple helium atoms is described, followed by conclusions
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