Spin-exchange
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In quantum mechanics, spin-exchange is an interaction process between two particles mediated by an exchange interaction.[1] It preserves total angular momentum of the system but may allow other aspects of the system to change. When two spin-polarized atoms in their ground state experience a spin-exchange collision, the total spin of the atoms is preserved yet the orientation of the individual spins may change. For example, if atoms and are oppositely polarized, a spin-exchange collision reverses the spins:[2]
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