Loftus T, Regal C A, Ticknor C, Bohn J L, Jin D S
JILA, National Institute of Standards and Technology, University of Colorado, Boulder, Colorado 80309, USA.
Phys Rev Lett. 2002 Apr 29;88(17):173201. doi: 10.1103/PhysRevLett.88.173201. Epub 2002 Apr 12.
We have loaded an ultracold gas of fermionic atoms into a far-off resonance optical dipole trap and precisely controlled the spin composition of the trapped gas. We have measured a magnetic-field Feshbach resonance between atoms in the two lowest energy spin states, /9/2,-9/2> and /9/2,-7/2>. The resonance peaks at a magnetic field of 201.5+/-1.4 G and has a width of 8.0+/-1.1 G. Using this resonance, we have changed the elastic collision cross section in the gas by nearly 3 orders of magnitude.
我们已将费米子原子的超冷气体加载到远失谐光学偶极阱中，并精确控制了捕获气体的自旋组成。我们测量了处于两个最低能量自旋态/9/2, -9/2>和/9/2, -7/2>的原子之间的磁场费什巴赫共振。该共振在201.5±1.4 G的磁场处出现峰值，宽度为8.0±1.1 G。利用这个共振，我们已将气体中的弹性碰撞截面改变了近3个数量级。
