A Spectroscopic Determination of Scattering Lengths for Sodium Atom Collisions
A Spectroscopic Determination of Scattering Lengths for Sodium Atom Collisions
复制标题
钠原子碰撞散射长度的光谱测定
DOI：
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发表时间：
1996
影响因子：
1.5
通讯作者：
W. Phillips
中科院分区：
文献类型：
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作者：
E. Tiesinga;Carl J. Williams;P. Julienne;K. M. Jones;P. Lett;W. Phillips
我们给出了零磁场Na2S(f=1，m=−1)+Na2S(f=1，m=−1)散射长度a1，−1的初值。这个参数描述了复合玻色子稀气中的低能弹性两体过程，并在很大程度上决定了囚禁中玻色凝聚体的宏观波函数。我们的散射长度是从未凝聚原子样品的光缔合光谱中获得的。原子的温度足够低，以至于最低的三个分波的贡献主导了光谱。观测到的纯长程0g−分子态的线形使我们能够确定基态散射波函数的关键特征。在0g−势曲线的最深处(Re=72a0)附近偶然出现一个p波节点有助于确定a1，−1=(52±5)a0和a2，2=(85±3)a0，其中a2=(85±3)a0是两个Na2S(f=2，m=2)原子碰撞的结果。
We report a preliminary value for the zero magnetic field Na 2S(f = 1, m = − 1) + Na 2S(f = 1, m = − 1) scattering length, a1,−1. This parameter describes the low-energy elastic two-body processes in a dilute gas of composite bosons and determines, to a large extent, the macroscopic wavefunction of a Bose condensate in a trap. Our scattering length is obtained from photoassociative spectroscopy with samples of uncondensed atoms. The temperature of the atoms is sufficiently low that contributions from the three lowest partial waves dominate the spectrum. The observed lineshapes for the purely long-range 0g− molecular state enable us to establish key features of the ground state scattering wavefunction. The fortuitous occurrence of a p-wave node near the deepest point (Re = 72 a0) of the 0g− potential curve is instrumental in determining a1,−1 = (52 ± 5) a0 and a2,2 = (85 ± 3) a0, where the latter is for a collision of two Na 2S(f = 2, m = 2) atoms.