Determination of Cs–Cs interaction parameters using Feshbach spectroscopy

Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI:10.1016/S1296-2147(01)01196-9

Andrew J. Kerman , Cheng Chin , Vladan Vuletić , Steven Chu , Paul J. Leo , Carl J. Williams , Paul S. Julienne

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引用次数: 6

Abstract

We measure high-resolution Feshbach resonance spectra for ultracold cesium atoms colliding in different hyperfine and magnetic sublevels. More than 25 Feshbach resonances are observed for magnetic fields below 230 G in the elastic and inelastic ground state collision cross sections, as well as in the cross section for light-assisted collisions. From these spectra a consistent set of ground state molecular interaction parameters for cesium is extracted, including singlet and triplet scattering lengths of $A_{s} =(280±10)a_{0}$ and $A_{t} =(2400±100)a_{0}$ , a van der Waals coefficient $C_{6} =(6890±35)$ a.u., as well as the strength of the indirect spin–spin coupling. This set of parameters allows for the first time a complete characterization of cesium's ultracold-collision properties.

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费什巴赫光谱法测定Cs-Cs相互作用参数

我们测量了超冷铯原子在不同超细和磁性亚能级碰撞时的高分辨率费什巴赫共振光谱。在230 G以下的磁场下，在弹性和非弹性基态碰撞截面以及光辅助碰撞截面上观察到25个以上的费什巴赫共振。从这些光谱中提取了一组一致的铯基态分子相互作用参数，包括As=(280±10)a0和At=(2400±100)a0的单重态和三重态散射长度，van der Waals系数C6=(6890±35)a.u，以及间接自旋-自旋耦合的强度。这组参数第一次完整地描述了铯的超冷碰撞特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics

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