Planar Ion Funnel for Improved Control of Ion

Planar Ion Funnel for Improved Control of Ion Transmission and Temperature Cluster Studies Carley N. Folluo , Abbe y Mc. Mahon, Jarrett Mason, Carolin e Chick Jarrold Indiana Un iversity 1

Motivation – Reactivity Studies of Catalytic Species Cluster Generation & Reaction 2

Motivation – Reactivity Studies of Catalytic Species Cluster Generation & Reaction Mass Separation 3

Motivation – Reactivity Studies of Catalytic Species Cluster Generation & Reaction Mass Separation Photoelectron Spectroscopy Topolski, J. E. ; Kafader, J. O. ; Ray, M. ; Jarrold, C. C. J. Mol. Spectrosc. 2017, 336, 1– 11. 4

Source and Reactor – Current Configuration Beam Valve 2 Metal Target UHP He (4 -7 atm) Beam Valve 1 5

Source and Reactor – Modified Configuration Beam Valve 2 Metal Target s n nio a UHP He (4 -7 atm) Beam Valve 1 6

Characterization of Clusters in Presence of Ion Funnel Metal Target UHP He (4 -7 atm) Beam Valve 1 7

Some Applications of Planar Ion Funnels & RF-Carpets Wada, M. , et al. Nucl. Instruments Methods Phys. Res. Sect. B Beam Interact. with Mater. Atoms 2003, 204, 570– 581. 0 Wada, et al. - RIKEN facility (2003) Nuclear chemistry and physics applications Chaudhary, et al. - SRI International (2014) General miniaturized ion optics applications Chaudhary, A. ; van Amerom, F. H. W. ; Short, R. T. Rev. Sci. Instrum. 2014, 85 (10), 105101. Anthony, S. N. ; Shinholt, D. L. ; Jarrold, M. F. Int. J. Mass Spectrom. 2014, 371, 1– 7. Anthony, et al. - Indiana University (2014) Application with an electrospray interface Caroline Chick Jarrold Group, Indiana University (2019), Application with molecular beam valve 8

Planar Ion Funnel Design Equipotential surface generated in SIMION Ring Electrodes 1 2 3 4 5 6 Reactor Ion funnel consists of six 0. 1” thick stainless steel concentric rings fixated to a PEEK frame. 9

Ion Trajectory Simulations with SIMION Anions Cations Center ring and skimmer are grounded with the clustering channel and outer ring held at -20 V. An exponential gradient is applied to the funnel. 10

Instrumentation 11

Relative Ion Intensity Mass Spectra of 98 Mo Target Two possibilities of reduced low mass transmission: 1) Repulsion of lighter masses before reactor 2) Undesirable trajectories 12

Anion Photoelectron Spectroscopy Excited State Neutral hv Ground State Neutral Electron Binding Energy Mason, J. L. , et al. J. Phys. Chem. A. 2018, 122, 9879 -9885. 13

Anion Photoelectron Spectroscopy Excited State Neutral Ground State Neutral Electron Binding Energy hv Increased anion vibrational temperature Electron ejected with greater kinetic energy Hot bands Will sampling from different regions of the expansion cause hot bands in our spectra? Mason, J. L. , et al. J. Phys. Chem. A. 2018, 122, 9879 -9885. 14

Hot Band Analysis: Mn. Mo. O 3 - 15

Next Steps • Optimization • Continued hot band analysis • Analysis of cation throughput Key Takeaways • Signal increase observed! • No noticeable change in hot band signal 16

Acknowledgements Advisor: Prof. Caroline Chick Jarrold CC Jarrold Group: Dr. Michael Thompson Brett Williams Marissa Dobulis Jarrett Mason Abbey Mc. Mahon Past Members: Dr. Josey Topolski Dr. Kellyn Patros Joshua Ewigleben Indiana University College of Arts + Sciences

Ion Funnel Circuit Atmospheric Vacuum Clustering Channel Ring 6 Ring 5 Ring 4 1 2 3 4 5 6 Ring 3 Ring 2 Ring 1 18