Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 112: Development of Novel Methods I

O 112.9: Vortrag

Donnerstag, 19. März 2020, 17:15–17:30, WIL C107

Preparative mass spectrometry using electrospray controlled-ion-beam-deposition device — •Andreas Walz, Karolina Stoiber, Wei Ran, Annette Hüttig, Joachim Reichert, Hartmut Schlichting, and Johannes V. Barth — Physics Department E20, Technical University of Munich, Germany

Designing novel nanostructures of organic and anorganic compounds requires precise and controlled growth of atomically clean films of clusters or molecules on well-defined surfaces. Our home-build Electrospray Controlled Ion Beam Deposition device (ES-CIBD) opens access to the large, reactive and thermolabile species including biomolecules like proteins or DNA which had been excluded form investigation with standard deposition devices. The implemented Quadrupole Mass Spectrometer (QMS) allows for the characterization of the molecules as well as their purification prior to deposition. It is operated in a digital technique, allowing for very high m/z ratios and adaption of the resolution thereto. The innovative Radio Frequency (RF) controlled ion guides preserve the beam intensity of up to 1nA through the subsequent vacuum chambers from ambient conditions to ultrahigh vacuum (UHV). This allows for precise, short-time depositions, soft-landing conditions with 1-2 eV kinetic energy may be adjusted as well as reactive-landing conditions with some 100 eV. Simulations with SIMION assisted the design. Scanning tunneling microscopy (STM) investigations of large plasmid DNA molecules (1,7 MDa) and N-doped graphene nanoribbons proof quality and versatility of the depositions performed with the instrument.