Magnetic properties of O-2 adsorbed on Cu(100): A spin-polarized metastable He beam study

作者：Kurahashi M^*; Sun X; Yamauchi Y

来源：Physical Review B, 2012, 86(24): 245421.

DOI：10.1103/PhysRevB.86.245421

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 3 sigma and 1 pi(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). DOI: 10.1103/PhysRevB.86.245421

• 出版日期2012-12-20
• 单位中国科学技术大学