Loading...
Please wait, while we are loading the content...
Similar Documents
Cold atoms and molecules by Zeeman deceleration and Rydberg-Stark deceleration
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hogan, Stephen D. |
| Copyright Year | 2012 |
| Abstract | The preparation of atomic and molecular samples in selected internal quantum states at translational temperatures below 1 K by multistage Zeeman deceleration and Rydberg-Stark deceleration is described. The technique of multistage Zeeman deceleration exploits the interaction of paramagnetic atoms or molecules with inhomogeneous magnetic fields. It is suited to the deceleration of ground-state paramagnetic samples or those in long-lived, low-lying metastable states, which are initially moving in pulsed supersonic beams. Rydberg-Stark deceleration involves the photoexcitation of atoms or molecules to selected Rydberg states of high principal quantum number, n, which exhibit electric dipole moments on the order of 1000 Deybe. The interaction of samples in these states with inhomogeneous electric fields is exploited for acceleration, deceleration and trapping. The development of the technique of multistage Zeeman deceleration, which is described in this thesis, has centred around the deceleration of beams of hydrogen and deuterium atoms. Experimental studies of the particle dynamics within the decelerator have been performed and compared to the results of numerical simulations of particle trajectories, to quantify and optimise the efficiency of the deceleration process, and to minimise undesirable particle loss, for example via state-changing during the rapid switching of the ∼ 2 T magnetic fields of the decelerator. This has led to the first demonstration of magnetic trapping after multistage Zeeman deceleration which was achieved using hydrogen atoms, and the first demonstration of magnetic trapping deuterium atoms by any method. The trapped samples were detected by photoexcitation to Rydberg states followed by pulsed electric-field ionisation or by direct photoionisation, and exhibited translational temperatures of Ekin/kB ∼ 100 mK and number densities of ∼ 106 cm−3. Using a single-stage Rydberg-Stark decelerator and a three-dimensional electrostatic trap with a non-zero electric-field minimum, measurements, |
| File Format | PDF HTM / HTML |
| DOI | 10.3929/ethz-a-007577485 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/79555/eth-6217-01.pdf |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/79555/eth-6217-01.pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.3929/ethz-a-007577485 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
