用磁光阱和光学粘胶方法制备超冷原子样品 ,把原子冷却到绝对零度附近 (～ 10 - 6 K) ,随后赋予其一定的向上运动速度 (例如几米 /秒 ) ,让原子只在重力场作用下作弹道运动飞行 ,便形成冷原子喷泉———原子上升到一最高点然后散落下来 .这种原子喷泉首先在改进原子钟性能上获 Supercooled atomic samples are prepared by magneto-optical traps and optical viscoelastic methods. The atoms are cooled to near absolute zero (~ 10 -6 K) and subsequently given a certain upward velocity (for example a few meters per second) Field-effect ballistic flight, they form a cold atomic fountain --- the atom rises to a highest point and then scattered down.The atomic fountain first of all in improving the atomic clock performance