Côté, R.Dalgarno, A.Sun, Y.Hulet, R.G.2015-03-302015-03-301995Côté, R., Dalgarno, A., Sun, Y., et al.. "Photoabsorption by Ultracold Atoms and the Scattering Length." <i>Physical Review Letters,</i> 74, no. 18 (1995) American Physical Society: 3581-3583. http://dx.doi.org/10.1103/PhysRevLett.74.3581.https://hdl.handle.net/1911/79441It is shown that photoabsorption in a gas of ultracold atoms depends on the sign and magnitude of the scattering length in the scattering of a pair of atoms. Measurements of fluorescence in 7Li are interpreted to show that the triplet scattering length is negative and the singlet scattering length is positive.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.74.3581