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arXiv:cond-mat/0410160 · The European Physical Journal D

Prospects for measurement and control of the scattering length of metastable helium using photoassociation techniques

J. C. J. Koelemeij, Michèle Leduc

Published Nov 1, 2004• 15 citations
arXivHTMLPDF
DOI
10.1140/epjd/e2004-00154-7

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The paper reports on a new measurement method of the s-wave scattering length of metastable helium atoms by photoassociation (PA) technique. Lightshifts of the PA resonance lines are measured, which results from the coupling of a bound state in the excited state potential and the continuum of scattering states above the ground state potential. Ultracold molecules are formed by photoassociation from spin-polarized metastable helium atoms, which are trapped in a magnetic trap and cooled down to a temperature of 16 /spl mu/K by evaporative cooling technique. The PA laser is red detuned to the atomic D0 line (2/sup 3/S-2/sup 3/P/sub 0/) and scanned around the bound state levels in the purely long-range 0/sub 0//sup +/ potential to provide precise PA spectra.