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，同时调节团簇大小、团簇组成、吸附覆盖度、团簇温度和外部磁场。我们建议通过将X射线诱导的磁圆二向色性(XMCD)应用于被隔离在Penning类型离子陷阱中的选定大小的气相金属团簇来获得自旋和轨道贡献。这一新的实验方案将允许确定由自旋和轨道贡献引起的总磁矩。温度调谐和B场调谐应允许记录磁化曲线。这将通过将可调谐的圆偏振X射线同步辐射应用于孤立的气相转变金属团簇来实现，这些孤立的气相转变金属团簇已被选择大小并存储在超高真空下的傅立叶变换离子共振(FT-ICR)离子陷阱中。事实证明，在整个实际实验过程中对团簇温度进行低温控制变得至关重要。作为大规模协同实验的标准，我们选择创造一个首字母缩写来明确识别我们的努力：通过离子捕获游戏在BESSY的磁矩的通用抽象新的游戏设置计划在柏林固定安装在BESSY同步加速器用户束线BL52-PGM，它连接到波荡器UE 52。它应由本提案的三个小组联合运行，并将提供给通过标准程序过程中的申请和批准而获得资格的更多用户。

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.