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首页> 外文期刊>Physical review >Magnetic properties of O_2 adsorbed on Cu(100): A spin-polarized metastable He beam study
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Magnetic properties of O_2 adsorbed on Cu(100): A spin-polarized metastable He beam study

机译：吸附在Cu（100）上的O_2的磁性：自旋极化亚稳态He束研究

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摘要

Magnetic properties of O_2 adsorbed on Cu(100) were investigated by monitoring the spin dependence in Penning ionization of metastable He(2~3 S) under external magnetic fields of 0-5 T. A clear spin polarization was found for the 3σ_g and 1π_u orbitals of physisorbed O_2 under external fields, while the spin polarization disappeared when O_2 was changed into the chemisorbed state at >50 K. The magnetic susceptibility at the surface of multilayer and monolayer of physisorbed O_2 on Cu(100) was similar to that for the bulk liquid O_2. Observed exchange splittings and spin polarization suggest that a physisorbed O_2 molecule has a magnetic moment close to that for an isolated O_2 molecule even at submonolayer coverages, while a density functional theory calculation predicts a much reduced magnetic moment for O_2 directly adsorbed on Cu(100).
机译：通过在0-5 T的外部磁场下监测亚稳态He（2〜3 S）的Penning电离中的自旋依赖性来研究O_2吸附在Cu（100）上的磁性。发现3σ_g和1π_u的自旋极化清晰在外场下物理吸附的O_2的轨道，当O_2在> 50 K时变为化学吸附态时，自旋极化消失。Cu（100）上物理吸附的O_2的多层和单层表面的磁化率与本体液体O_2。观察到的交换分裂和自旋极化表明，即使在亚单层覆盖下，物理吸附的O_2分子的磁矩也接近于孤立的O_2分子，而密度泛函理论计算预测，直接吸附在Cu（100）上的O_2的磁矩将大大降低。 。

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