Abstract
Controlled atomic desorption from organic Poly-DiMethylSiloxane coating is demonstrated for improving the loading efficiency of 209,210Fr magneto-optical traps. A three times increase in the cold atoms population is obtained with contact-less pulsed light-induced desorption, applied to different isotopes, either bosonic or fermionic, of Francium. A six times increase of 210Fr population is obtained with a desorption mechanism based on direct charge transfer from a triboelectric probe to the adatom-organic coating complex. Our findings provide new insight on the microscopic mechanisms of atomic desorption from organic coatings. Our results, obtained at room temperature so as to preserve ideal vacuum conditions, represent concrete alternatives, independent from the atomic species in use, for high-efficiency laser cooling in critical conditions.
Highlights
In this work, we present evidence of two different desorption processes in coated cell devoted to laser cooling of radioactive Francium isotopes (209,210Fr)
Fr+ are routed to the experimental chamber, a Pyrex cell coated with PDMS, continuously evacuated down to
We have demonstrated the application of Light Induced Atom Desorption from a PDMS coated Pyrex surface to the loading of a Magneto-Optical Trap (MOT) of radioactive species. 209Fr and 210Fr MOTs were loaded by means of pulsed photodesorption from the organic coating produced by a broadband visible light pulse
Summary
We present evidence of two different desorption processes in coated cell devoted to laser cooling of radioactive Francium isotopes (209,210Fr). We show that desorption of the adsorbed atoms allows for increased MOT loading rate and trapping efficiency even in critical conditions such as those of laser cooling of radioactive atoms. These effects are reported here for the first time in the case of radioactive isotopes desorbed from an organic coating, and at room temperature. This allows to maintain the ideal conditions to carry out cold atoms experiments[7]. Together with recent observations from metal surfaces with stable[7, 8] and radioactive[9] elements, our results further extend the range of applications where atomic desorption has or will have a relevant impact
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