Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 98: Organic Molecules on Inorganic Substrates VII

O 98.1: Talk

Friday, April 5, 2019, 10:30–10:45, H17

An Electro Spray Ion Beam Deposition Device Employing Novel Ion Guide Concepts — •Andreas Walz, Peter Knecht, Karolina Stoiber, Hartmut Schlichting, and Johannes Barth — Physics Department E20, Technical University of Munich, Germany

The world of nanostructures requires precise control and growth of atomically clean films of clusters or molecules on well-defined surfaces. Most state of the art techniques like organic molecular beam epitaxy are limited to small and sublimable clusters or molecules. Electro Spray Controlled Ion Beam Deposition (ES-CIBD) gives access to reactive, larger and thermolabile species including many biomolecules. However, near ambient conditions for the generation of ions via electro spray ionization conflict with the ultra-high vacuum routinely required for the deposition via soft-landing and subsequent investigations. The challenge is to overcome pressure differences of 13 orders of magnitude while preserving high ion flux for appropriate preparation times as well as precise control of the deposited species.

Here we introduce advanced radio frequency ion optics combining highly efficient ion transmission with extremely low neutral gas leakage. We present a modified stacked ring ion guide combined with a novel high order multipole - the Small Wire Ion Guide (SWIG) - and a blade ion guide. The mass of the deposited species is determined by a digital quadrupole mass spectrometer with adjustable frequency and nearly unlimited mass range. Simulations using the software package SIMION have assisted the design. The deposited layers have been investigated with scanning tunneling microscopy.