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We present a new measurement of the s-wave scattering length a ofspin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photonphotoassociation spectroscopy and dark resonances we measure the energyE_{v=14}= -91.35 +/- 0.06 MHz of the least bound state v=14 in the interactionpotential of the two atoms. We deduce a value of a = 7.512 +/- 0.005 nm, whichis at least one hundred times more precise than the best previousdeterminations and is in disagreement with some of them. This experiment alsodemonstrates the possibility to create exotic molecules binding two metastableatoms with a lifetime of the order of 1 microsecond.Comment: 4 pages, 4 figure

Accurate Determination of the Scattering Length of Metastable Helium Atoms Using Dark Resonances between Atoms and Exotic Molecules