Title:	Measurement of collisions between laser-cooled cesium atoms and trapped cesium ions
Authors:	Dutta, Sourav Rangwala, S.A.
Issue Date:	Sep-2020
Publisher:	American Physical Society
Citation:	Physical Review A, 2020, Vol.102, Article. No.033309
Abstract:	We report the measurement of collision rate coefficient for collisions between ultracold Cs atoms and low-energy C s+ ions. The experiments are performed in a hybrid trap consisting of a magneto-optical trap (MOT) for Cs atoms and a Paul trap for C s+ ions. The ion-atom collisions impart kinetic energy to the ultracold Cs atoms, resulting in their escape from the shallow MOT and, therefore, in a reduction in the number of Cs atoms in the MOT. By monitoring, using fluorescence measurements, the Cs atom number, and the MOT loading dynamics and then fitting the data to a rate equation model, the ion-atom collision rate is derived. The Cs -C s+ collision rate coefficient 9.3 (±0.4 ) (±1.2 ) (±3.5 ) ×10-14m3s-1 , measured for an ion distribution with most probable collision energy of 95 meV (≈kB1100 K ) , is in fair agreement with theoretical calculations. As an intermediate step, we also determine the photoionization cross section of Cs 6 P3 /2 atoms at 473 nm wavelength to be 2.28 (±0.33 ) ×10-21m2 .
Description:	Open Access
URI:	http://hdl.handle.net/2289/7537
ISSN:	2469-9926 2469-9934 (online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2020PhRvA.102c3309D/abstract https://arxiv.org/abs/2008.08396 https://doi.org/10.1103/PhysRevA.102.033309
Copyright:	2020 American Physical Society
Appears in Collections:	Research Papers (LAMP)

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