When the frequency of laser standingwave is higher than the resonant frequency of atoms, the atoms will be focused on the wavenode of the standingwave.
当激光驻波场的频率大于原子的共振频率时，原子由于受到偶极力的作用将被会聚到驻波的波节处。
2
Under the frequency of resonance, small particles which are in the bottom of an upright standingwave tube will rise and move to the node, or loop planes, and keep suspending there.