Abstract
An original design of magnetic guide is presented, suitable for use with Zeeman-decelerated supersonic beams of ground-state hydrogen atoms and other light paramagnetic species. Three-dimensional particle trajectory simulations show that, by combining a series of permanent-magnet Halbach arrays with pulsed high-current wire electromagnets, this guide can be used to efficiently transmit the slow, decelerated atoms and discard the faster, undecelerated atoms and other species in the gas beam. The curved guide would be suitable for guiding hydrogen atoms into an ion trap to investigate low temperature ion-molecule collisions. It is also shown that the device could be used for the guiding or velocity selection from an undecelerated supersonic or effusive beam.
Highlights
The study of cold and ultracold collisions paves the way towards the understanding of chemical reaction dynamics in a still vastly unexplored temperature regime
To determine chemical reaction rates between the Zeeman-decelerated atoms or molecules and the trapped ions as a function of collision energy, it would be necessary to filter out the precursor molecules, carrier gas atoms and all other particles that are outside the phase-space volume accepted by the decelerator
In experiments with ground-state H atoms, NH3 precursor molecules, NH2 molecules produced during photolysis, undecelerated and partially decelerated/accelerated H atoms as well as carrier gas atoms can be transmitted through the Zeeman decelerator and can potentially corrupt or compromise accurate reaction rate measurements
Summary
The study of cold and ultracold collisions paves the way towards the understanding of chemical reaction dynamics in a still vastly unexplored temperature regime. There have been various approaches to achieve magnetic guiding, either using wire geometries [4,15,16,17,18,19,20] or permanent-magnet assemblies [21,22,23,24,25,26] These designs did not aim at a variation of the maximum guidable velocity which is required for the use of Zeeman-decelerated supersonic beams (typical velocities between 100–500 m/s in the case of H atoms [13,14]) in collision-energy-dependent reaction studies in ion traps. We propose a scheme for a bent hybrid magnetic
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
