Drag C, T'Jampens B, Comparat D, Allegrini M, Crubellier A, Pillet P
Laboratoire Aime Cotton, CNRS II, Batiment 505, Campus d'Orsay, 91405 Orsay Cedex, France.
Phys Rev Lett. 2000 Aug 14;85(7):1408-11. doi: 10.1103/PhysRevLett.85.1408.
In photoassociation spectroscopy, the line intensities of a given vibrational progression exhibit zero-signal modulation reflecting the node structure of the s-wave ground state wave function of two free colliding atoms. This leads to the determination of the scattering length. We performed photoassociation of cold Cs atoms polarized in the Zeeman sublevel f = 4, m(f) = 4. We analyzed the intensities of the lines associated with the Cs2 0(-)(g) state dissociating to the 6s(1/2)+6p(3/2) asymptote. This yields a value of the Cs triplet state scattering length, a(T) = -530a(0), while consistency requirements impose a value of the multipole ground state molecular coefficient, C6 = 6510 a.u.
