Morgan, AA;
Zhelyazkova, V;
Hogan, SD;
(2018)
Preparation of circular Rydberg states in helium with n ≥ 70 using a modified version of the crossed-fields method.
Physical Review A
, 98
(4)
, Article 043416. 10.1103/PhysRevA.98.043416.
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Abstract
Circular Rydberg states with n = 70 have been prepared in helium using a modified version of the crossed-fields method. This approach to the preparation of high-n circular Rydberg states overcomes limitations of the standard crossed-fields method which arise at this, and higher, values of n. The experiments were performed with atoms traveling in pulsed supersonic beams that were initially laser photoexcited from the metastable 1s2s³S₁ level to the 1s73s³S₁ level by resonance-enhanced two-color two-photon excitation in a magnetic field of 16.154 G. These excited atoms were then polarized using a perpendicular electric field of 0.844 V/cm, and transferred by a pulse of microwave radiation to the state that, when adiabatically depolarized, evolves into the n = 70 circular state in zero electric field. The excited atoms were detected by state-selective electric field ionization. Each step of the circular state preparation process was validated by comparison with the calculated atomic energy-level structure in the perpendicular electric and magnetic fields used. Of the atoms initially excited to the 1s73s³S₁ level, ∼ 80% were transferred to the n = 70 circular state. At these high values of n, Δn = 1circular-to-circular Rydberg state transitions occur at frequencies below 20 GHz. Consequently, atoms in these states, and the circular state preparation process presented here, are well suited to hybrid cavity QED experiments with Rydberg atoms and superconducting microwave circuits.
| Type: | Article |
|---|---|
| Title: | Preparation of circular Rydberg states in helium with n ≥ 70 using a modified version of the crossed-fields method |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevA.98.043416 |
| Publisher version: | https://doi.org/10.1103/PhysRevA.98.043416 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Atomic & molecular processes in external fields, Rydberg atoms & molecules, Atomic, Molecular & Optical |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10060133 |
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