Trapping long-lived Rydberg states of nitric oxide

The first talk in this year’s series of AMOPP seminars was given by Dr. Adam Deller from Prof. Hogan’s group in UCL. Adam, who was one of the first members in the UCL Ps spectroscopy group, talked about miniaturised Rydberg-Stark decelerators used to trap nitric oxide molecules. Abstract below.

Trapping long-lived hydrogenic Rydberg states of nitric oxide

High Rydberg states of atoms or molecules can have extremely large static electric dipole moments, upon which an inhomogeneous electric field will exert a sizable force. Electrostatic or time-varying electric fields have been utilised to exploit this effect to guide or decelerate and trap H, He, Ps and also H2.

I will describe a compact chip-based Rydberg-Stark decelerator comprised of a linear array of 115 electrodes. And I will present the results of recent experiments in which this device was employed to decelerate and trap laser excited NO molecules. An average lifetime of approximately 300 us was measured for molecules in the cryogenic trap. These cold, trapped NO molecules are of interest for studying low-temperature inelastic scattering processes for which long-range interaction play an important role.



The Ps Spectroscopy team had the delight of attending the 15th International Workshop on Slow Positron Beam Techniques and Applications (SLOPOS-15) in Prague on 2-6 September, 2019. The workshop was held in the Faculty of Mathematics and Physics, Charles University in the centre of the Lesser Town square.


A wide range of topics, from Ps physics to defect studies, were discussed by over 100 participants in the workshop. David outlined the recent experimental progress in Ps-laser physics in his talk, while Ross talked about the versatility of a multi-ring guide for possible Ps deceleration and trapping studies. Lokesh presented the results of the new precision microwave spectroscopy experiment (stay tuned for more details). The complete list of abstracts can be found here. It was a pleasure discussing the ongoing work in the field of slow positron physics in the wonderful city of Prague.

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We’d like to thank the local organising committee, led by Jakub Cizek, for organising an excellent meeting and we look forward to the next SLOPOS which will be held in OrlĂ©ans, France in 2022.