A single spin-rotational state-selected [(
J,
M)=(2, 2)] O
2 beam allows us to investigate how the molecular alignment and electron spin affect oxygen chemisorption. Recent experiments of O
2 chemisorption on magnetized Ni(111) have indicated that O
2 sticking probability is higher when its spin is oriented anti-parallel to the majority spin direction of the Ni substrate. The spin dependence becomes more significant at lower translational energy, and amounts to over 40% at thermal energy. This clear spin effect suggests that incident O
2 molecules keep high spin polarizations even at the position of the dissociation barrier. In this article, the observed spin effect is reviewed after introducing the spinrotational state of O
2 (
3Σ
g-).
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