Schweikert Research Group

Selected Publications

Hypervelocity Cluster Ion Impacts on Free-standing Graphene: Experiment, Theory and Applications, S.V. Verkhoturov, M. Gołuński, D.S. Verkhoturov, B. Czerwinski, M.J. Eller, S. Geng, Z. Postawa, E.A. Schweikert, J. Chem. Phys., 150, 160901 (2019). doi:10.1063/1.5080606

Label Free Particle-by-Particle Quantification of DNA-Loading on Sorted Gold Nanostars, M.J. Eller, K. Chandra, E.E. Coughlin, T.W. Odom, E.A. Schweikert, Analyt. Chem., 91, 5566-5572 (2019). doi:10.1021/acs.analchem.8b03715

"Trampoline" Ejection of Organic Molecules from Graphene and Graphite vis keV Cluster Ion Impacts, S.V. Verkhoturov, M. Gołuński, D.S. Verkhoturov, B. Czerwinski, M.J. Eller, S. Geng, Z. Postawa, E.A. Schweikert, J. Chem. Phys., 148, 144309 (2018). doi:10.1063/1.5021352

Molecular Co-localization Using Massive Gold Cluster Secondary Ion Mass Spectrometry, M.J. Eller, A. Vinjaumuri, B.E. Tomlin, E.A. Schweikert, Analyt. Chem., 90, 12693-12697 (2018). doi:10.1021/acs.analchem.8b02950

Ejection-ionization of Molecules from Free-Standing Graphene, S.V. Verkhoturov, B. Czerwinski, D.S. Verkhoturov, S. Geng, A. Delcorte, E.A. Schweikert,J. Chem. Phys., 146, 084308 (2017). doi:10.1063/1.4976832

Instrumentation

Schematic of the Imaging SIMS. Module I, contains the primary ion source (currently C60, to be replaced with Au- and Bi-LMIS), mass filter (to be upgraded), acceleration stage (currently 15 kV, to be replaced with 200 kV set-up), primary ion optics and pulsing for achieving the conditions of single projectile bombardment. Module II, consist of the sample stage, an immersion objective (L1, Slodzian type) and a magnetic prism with achromatic deflection (Liebl type). Module III, contains the electron optics and electron imaging detector. The optics (L2-L4) are those of an emission electron microscope, calculated to minimize spherical and chromatic aberrations. The electron imaging detector consists of a dual MCP, a phosphor screen attached to a fiber optic rod (Beam Imaging Solution Inc.) and a CMOS camera (Basler A504k). Module IV, corresponds to the SI ToF region with a 8- or 16- anode detector.  Module V (planned, hence the dotted lines), is composed of the VUV laser with optics for the postionization experiments.