The spin and orbit contributions to the magnetic moments of isolated clusters

我们计划深入研究自旋和轨道对自由过渡金属团簇总磁矩的贡献，同时调整团簇大小、团簇组成、吸附物覆盖率、团簇温度和外部磁场。我们建议获得自旋和轨道的贡献，通过应用X射线诱导的磁性圆二色性（XMCD）的气相金属团簇的选定大小时，隔离在一个Penning型离子阱。这种新的实验方案应允许确定总磁矩所产生的自旋和轨道的贡献。温度调谐和B场调谐应允许记录磁化曲线。这将通过将可调圆偏振X射线同步加速器辐射应用于隔离的气相过渡金属簇来实现，这些金属簇已经过尺寸选择并存储在超高真空下的傅里叶变换离子回旋共振（FT-ICR）离子阱中。在整个实际实验过程中，对团簇温度的低温控制变得至关重要。作为标准的大规模协同实验，我们选择硬币的首字母缩写词明确识别我们的努力：广义抽象的磁矩在BESSY的离子捕获GAMBIT新的GAMBIT设置计划固定安装在柏林的BESSY同步加速器用户光束线BL 52-PGM的接口的波荡器UE 52。它将由本提案的三个小组共同运作，并将提供给通过标准程序申请和批准而有资格的其他用户。

We plan to pursue an in depth investigation of the spin and orbit contributions to the total magnetic moments of free transition metal clusters while tuning cluster size, cluster composition, adsorbate coverage, cluster temperature and external magnetic field. We propose to obtain the spin and orbit contributions through application of X-ray induced magnetic circular dichroism (XMCD) to the gas phase metal clusters of selected sizes when isolated within a Penning type ion trap. This novel experimental scheme shall allow for the determination of total magnetic moments as arising through spin and orbit contributions. Temperature tuning and B-field tuning shall allow for the recording of magnetization curves. This shall be enabled through application of tunable circularly polarized X-ray synchrotron radiation to isolated gas phase transition metal clusters that have been size selected and stored in an Fourier-Transform-lon-Cyclotron-Resonance (FT-ICR) ion trap under ultra high vacuum. Cryogenic control of cluster temperature throughout the course of the actual experiment turns out to become crucial. As is standard in large scale concerted experiments we choose to coin an acronym for unambiguous identification of our effort: Generalized Abstraction of Magnetic moments at BESSY by Ion Trapping GAMBIT The new GAMBIT setup is scheduled for stationary installation in Berlin at the BESSY synchrotron user beam line BL52-PGM which interfaces to the undulator UE 52. It shall be operated jointly by the three groups of this proposal and will become available to further users who qualify through application and approval in the course of standard procedures.