Espenship Michael F, Laskin Julia
James Tarpo Jr. and Margaret Tarpo Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.
J Am Soc Mass Spectrom. 2024 Oct 2;35(10):2472-2479. doi: 10.1021/jasms.4c00274. Epub 2024 Sep 10.
We have designed and constructed a low-cost Wien filter based on strong permanent magnets and integrated it into an ion soft-landing instrument to enable parallel deposition as well as one- and two-dimensional surface patterning of mass-selected ions using dynamic fields. We show the capabilities of this device for separating ions from a multicomponent high-flux continuous ion beam and simultaneous deposition of ions of different mass-to-charge ratios onto discrete locations on a surface. When a dynamic electric field is applied parallel to the magnetic field, ions are deposited in one-dimensional arrays, laterally separated by mass. The field's strength, frequency, and waveform type determine both the lengths of the arrays and the density of ions across the 1-D pattern. Additionally, a second dynamic field from user-defined waveforms orthogonal to the magnetic field enables two-dimensional surface patterning of ions while maintaining mass separation. These experiments demonstrate the practical utility of a Wien filter for the controlled fabrication of interfaces with arbitrary patterns of mass-selected ions.
我们设计并构建了一种基于强永磁体的低成本维恩滤波器，并将其集成到离子软着陆仪器中，以实现平行沉积以及利用动态场对质量选择离子进行一维和二维表面图案化。我们展示了该装置从多组分高通量连续离子束中分离离子，并将不同质荷比的离子同时沉积到表面离散位置的能力。当平行于磁场施加动态电场时，离子会以一维阵列形式沉积，按质量横向分离。场强、频率和波形类型决定了阵列的长度以及一维图案上离子的密度。此外，来自与磁场正交的用户定义波形的第二个动态场能够在保持质量分离的同时实现离子的二维表面图案化。这些实验证明了维恩滤波器在可控制造具有质量选择离子任意图案的界面方面的实际效用。
