Werner J, Griesmaier A, Hensler S, Stuhler J, Pfau T, Simoni A, Tiesinga E
5 Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany.
Phys Rev Lett. 2005 May 13;94(18):183201. doi: 10.1103/PhysRevLett.94.183201. Epub 2005 May 9.
We have observed Feshbach resonances in collisions between ultracold 52Cr atoms. This is the first observation of collisional Feshbach resonances in an atomic species with more than one valence electron. The zero nuclear spin of 52Cr and thus the absence of a Fermi-contact interaction leads to regularly spaced resonance sequences. By comparing resonance positions with multichannel scattering calculations we determine the s-wave scattering length of the lowest (2S+1)Sigma(+)(g) potentials to be 112(14) a(0), 58(6) a(0), and -7(20) a(0) for S=6, 4, and 2, respectively, where a(0)=0.0529 nm.
我们在超冷52Cr原子之间的碰撞中观测到了费什巴赫共振。这是首次在具有多个价电子的原子种类中观测到碰撞费什巴赫共振。52Cr的零核自旋以及因此不存在费米接触相互作用导致了共振序列等间距分布。通过将共振位置与多通道散射计算结果进行比较，我们确定对于S = 6、4和2，最低(2S + 1)Σ+(g)势的s波散射长度分别为112(14) a0、58(6) a0和 -7(20) a0，其中a0 = 0.0529 nm。
