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Penning collisions of laser-cooled metastable helium atoms |
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| Authors: | F Pereira Dos Santos F Perales J Léonard A Sinatra Junmin Wang F Saverio Pavone E Rasel CS Unnikrishnan M Leduc |
| Institution: | Laboratoire Kastler Brossel, Département de Physique de l'école Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, FR Laboratoire de Physique des Lasers, Université Paris-Nord, avenue J.B. Clément, 93430 Villetaneuse, France, FR Dept. of Physics, Univ. of Perugia, Via Pascoli, Perugia, Italy, IT Universit?t Hannover, Welfengarten 1, 30167 Hannover, Germany, DE TIFR, Homi Bhabha Road, Mumbai 400005, India, IN |
| Abstract: | We present experimental results on the two-body loss rates in a magneto-optical trap of metastable helium atoms. Absolute rates are measured in a systematic way for several laser detunings ranging from -5 to -30 MHz and at different intensities, by monitoring the decay of the trap fluorescence. The dependence of the two-body loss rate coefficient β on the excited state ( 23 P 2) and metastable state ( 23 S 1) populations is also investigated. From these results we infer a rather uniform rate constant K sp = (1±0.4)×10-7 cm3/s. Received 8 September 2000 and Received in final form 19 December 2000 |
| Keywords: | PACS 32 80 Pj Optical cooling of atoms trapping – 34 50 Rk Laser-modified scattering and reactions |
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