三重項酸素とゼロ磁場分裂：スピン状態が支配する化学反応

Triplet Oxygen and Zero-Field Splitting: How Spin States Govern Chemical Reactions

Abstract: Molecular oxygen (O₂) has a triplet ground state. We introduce zero-field splitting (ZFS)—the splitting of spin sublevels without any external magnetic field—and explain why O₂’s three spin states are inherently split. We discuss how this built-in splitting renders O₂’s reactivity with radical (doublet) species almost insensitive to external m…