A Cryogenic Molecular Ion-Neutral Hybrid Trap

von Planta, Claudio. A Cryogenic Molecular Ion-Neutral Hybrid Trap. 2020, Doctoral Thesis, University of Basel, Faculty of Science.


Official URL: https://edoc.unibas.ch/80505/

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A hybrid trap was developed to confine neutral molecules and molecular ions. We demonstrated the long-term trapping of Stark-decelerated OH radicals in the X 2Pi3/2 (v = 0, J = 3/2, MJ = 3/2, f) state in a permanent magnetic trap. The trap environment was cryogenically cooled to a temperature of 17 K in order to efficiently suppress black-body-radiation-induced pumping of the molecules out of trappable quantum states and collisions with residual background gas molecules which usually limit the trap lifetimes. The cold molecules were kept confined on timescales approaching minutes, an improvement of up to two orders of magnitude compared to room-temperature experiments, at translational temperatures on the order of 25 mK. A cryogenic ion trap was built and laser cooled Ca+ ions were confined. This ion trap can be used to confine sympathetically cooled molecular ions such as N+2or H2O+. Furthermore, a mechanism to superimpose both trap centers by moving the permanent magnets from the magnetic trap over the ion trap was developed. Both traps were characterized and their functionality was proven. The challenges of lasercooling in the strong magnetic field gradients were discussed. The present results pave the way for investigations of cold collisions and reactions with very small reaction rates between molecular ions and neutral molecules, for new avenues for the production of ultracold molecules via sympathetic cooling and for the realization of new forms of hybrid matter with co-trapped atoms or ions.
Advisors:Willitsch, Stefan and Heazlewood, Brianna
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Chemische Physik (Willitsch)
UniBasel Contributors:von Planta, Claudio and Willitsch, Stefan
Item Type:Thesis
Thesis Subtype:Doctoral Thesis
Thesis no:14003
Thesis status:Complete
Number of Pages:v, 145
Identification Number:
  • urn: urn:nbn:ch:bel-bau-diss140037
edoc DOI:
Last Modified:05 Mar 2021 05:30
Deposited On:04 Mar 2021 09:07

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