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Title: Light desorption from an yttrium neutralizer for Rb and Fr magneto-optical trap loading

We present here the first evidence of photodesorption induced by low-intensity non-resonant light from an yttrium thin foil, which works as a neutralizer for Rb and Fr ions beam. Neutral atoms are suddenly ejected from the metal surface in a pulsed regime upon illumination with a broadband flash light and then released in the free volume of a pyrex cells. Here atoms are captured by a Magneto-Optical Trap (MOT), which is effectively loaded by the photodesorption. Loading times of the order of the flash rise time are measured. Desorption is also obtained in the continuous regime, by exploiting CW visible illumination of the metallic neutralizer surface. We demonstrate that at lower CW light intensities vacuum conditions are not perturbed by the photodesorption and hence the MOT dynamics remains unaffected, while the trap population increases thanks to the incoming desorbed atoms flux. Even with the Y foil at room temperature and hence with no trapped atoms, upon visible illumination, the number of trapped atoms reaches 10{sup 5}. The experimental data are then analyzed by means of an analytical rate equation model, which allows the analysis of this phenomenon and its dynamics and allows the determination of critical experimental parameters and themore » test of the procedure in the framework of radioactive Francium trapping. In this view, together with an extensive investigation of the phenomenon with {sup 85}Rb, the first demonstration of the photodesorption-aided loading of a {sup 210}Fr MOT is shown.« less
Authors:
; ; ; ; ; ;  [1] ; ;  [2] ; ; ;  [3] ; ; ;  [4] ;  [5]
  1. DSFTA and CNISM, University of Siena, via Roma 56, 53100 Siena (Italy)
  2. INFN – Laboratori Nazionali di Legnaro, viale dell’Università 2, 35020 Legnaro (Italy)
  3. Cyclotron and Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578 (Japan)
  4. University of Ferrara and INFN, via Saragat 1, 44122 Ferrara (Italy)
  5. Physics Department, University of Trento, via Sommarive 14, 38123 Povo (Italy)
Publication Date:
OSTI Identifier:
22436548
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ATOMS; DESORPTION; FRANCIUM; FRANCIUM 210; FRANCIUM IONS; REACTION KINETICS; RUBIDIUM 85; YTTRIUM