Photoassociative spectroscopy of collisions between ultracold lithium atoms

[摘要] The spectra of the high-lying vibrational levels of the $Asp1Sigmasbsp{u}{+}$ and $1sp3Sigmasbsp{g}{+}$ singly excited states of both $sp6m Lisb2$ and $sp7m Lisb2$ are obtained via photoassociation of colliding ultracold atoms confined in a magneto-optical trap. The least bound state of the $asp3Sigmasbsp{u}{+}$ ground state potential, obtained by two-photon photoassociative spectroscopy, is also presented for both $sp7m Lisb2$ and $sp6m Lisb2$. The vibrational levels have resolved hyperfine structure, whose relative energy splittings and transition strengths are accurately modeled. The photoassociative spectra are used to precisely determine both the singlet and triplet s-wave scattering lengths for both isotopes, which are important parameters in systems designed to observe quantum degenerate effects and Bose-Einstein condensation.

[发布机构] Rice University

[效力级别] physics