从对称性出发，讨论了电子自旋对单电子体系能量简并的影响，并得出影响的一般规律。
The influence that spin of an electron affects energy degeneracy of one-electron system is discussed from symmetry, and the general law of the influence is produced.
结果表明：对于异自旋三自由基体系，形成异自旋后对称性降低使部分占据的近简并轨道能级劈裂值增大，反铁磁耦合作用普遍增强。
The result shows that part-occupied near-degenerate orbitals split value and dia ferromagnetic coupling increases when symmetry of hetero tri-radicals decreases.
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