评述了光抽运和自旋交换碰撞中角动量转移和损失的物理。

This article reviews the physics of angular momentum transfer and loss in optical pumping and spin-exchanging collisions.

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最后，提出了因自旋交换碰撞和自旋销毁碰撞引起的极化原子的自旋弛豫。

Finally, spin relaxation of polarized atom due to spin-exchange collisions and spin-destruction collisions is put forward.

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当离子在鞘层运动时，考虑离子与中性原子之间的电荷交换和弹性碰撞，以及离子被尘粒的库仑散射和收集作用。

The charge exchange and elastic collision between ion and neutral atoms and the collection and Coulomb scattering of ion on dust grains are considered.

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