Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 68: Nanostructured surfaces and thin films – Poster

O 68.1: Poster

Wednesday, March 11, 2026, 18:00–20:00, P2

Electrospray Ion-Beam Deposition of Organic Molecules — •Grigori Pasko, Florian Münster, Lukas Heuplick, Jan Herritsch, and J. Michael Gottfried — Fachbereich Chemie, Philipps-Universität Marburg, Germany

The preparation of molecular adsorbates on surfaces is often constrained by limitations of conventional deposition methods. While small molecules can typically be thermally evaporated from a Knudsen cell, this approach becomes unsuitable for larger or non-volatile species. Electrospray ion-beam deposition (ESIBD) provides a powerful alternative, enabling the transfer of intact, non-volatile molecules from solution into ultrahigh vacuum. Although its use is increasing, ESIBD remains an emerging technique, and the chemical state of the molecules after deposition is often insufficiently understood. Determining the oxidation state and overall chemical composition of the deposited species therefore represents a central challenge. In this study, meso-tetraphenylporphyrin (TPP) serves as a model system for evaluating the chemical integrity of ESIBD-prepared films. By combining X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations, we demonstrate that the porphyrins preserve the protonation state acquired during the electrospray process and remain intact upon deposition.

Keywords: Electrospray Ion-Beam Deposition (ESIBD); Soft Landing; Scanning Tunneling Microscopy (STM); X-Ray Photoelectron Spectroscopy (XPS); Tetraphenylporphyrin