离子阱中X射线磁圆二色谱法直接观测锰二聚体和三聚体阳离子的高自旋态
Direct Observation of High-Spin States in Manganese Dimer and Trimer Cations by X-ray Magnetic Circular Dichroism Spectroscopy in an Ion Trap
摘要：
在耦合到同步辐射光束线的低温离子阱中，用$2p$ X射线吸收谱和X射线磁性圆二色谱研究了自由Mn $_2^+$和Mn $_3^+$的电子结构和磁矩.我们的研究结果直接表明，5 $μ_B$的本地化磁矩创建的$3d^5 (^6\mathrm{S})$状态在每个离子核心，这是在平行耦合，形成分子高自旋状态通过间接交换介导的，在这两种情况下由一个离域价电子在一个单一的占领$4s$导出的轨道与未配对的自旋。这导致Mn $_2^+$的总磁矩为11 $μ_B$，Mn $_3^+$的总磁矩为16 $μ_B$，没有轨道角动量的贡献。
英文摘要：
The electronic structure and magnetic moments of free Mn$_2^+$ and Mn$_3^+$ are characterized by $2p$ x-ray absorption and x-ray magnetic circular dichroism spectroscopy in a cryogenic ion trap that is coupled to a synchrotron radiation beamline. Our results show directly that localized magnetic moments of 5 $μ_B$ are created by $3d^5 (^6\mathrm{S})$ states at each ionic core, which are coupled in parallel to form molecular high-spin states via indirect exchange that is mediated in both cases by a delocalized valence electron in a singly-occupied $4s$ derived orbital with an unpaired spin. This leads to total magnetic moments of 11 $μ_B$ for Mn$_2^+$ and 16 $μ_B$ for Mn$_3^+$, with no contribution of orbital angular momentum.
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