If a magnetic field gradient is superimposed on the uniform field, those atoms whose magnetic moments are aligned with the field will have lower energies in a higher field. Like a ball rolling down a hill, these atoms will tend to occupy locations with higher field and so are called "high-field-seeking" atoms. Conversely, those atoms with magnetic moments aligned opposite to the field will have higher energies in a higher field, tend to occupy locations with lower field, and so are called "low-field-seeking" atoms. It is impossible to produce a local maximum of the magnetic field magnitude in free space. However, a local minimum can be produced. This minimum can trap atoms which are low-field seeking if they do not have enough kinetic energy to escape the minimum. 请问有人可以解释上面的原理吗 感激不尽 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.115.202.90