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Holografia gamma - trójwymiarowe obrazowanie lokalnej struktury z rozdzielczością atomową

Korecki P., Korecki J.

Postępy Fizyki

2001

T. 52, z. 5

225-237

Principles of gamma-ray holography using an internal sources/detectors scheme of holography and allowing for three-dimensional model free imaging of local atomic structure with nuclear resonant scattering of gamma-radiation (Moessbauer effect), are presented. First experimental results for a test system: 57Fe/Mg0(001) epitaxial film are discussed. The idea of complex holography, solving the twin-image problem, is presented and the possibility of studying local magnetic structure on atomic level is elucidated.

Scanning probe microscopy of self-assembled organic monolayers

Cyganik P., Korecki P., Szymońska J., Szymoński M., Postawa Z.

Electron Technology

1998

Vol. 31, No. 3/4

440-446

STM/AFM and LFM microscopes were used for morphological analysis of uniform and patterned self-assembled monolayers (SAMs) formed from docosanethiol (HS-(CH₂)₁₁CH₃), dodecanethiol (HS-(CH₂)₁₁CH₃) and mercaptododecanoic acid (HS-(CH₂)₁₁COOH) molecules adsorbed at 200nm gold film deposited onto silicon wafer. All measurements were performed in air. The lateral distances between atoms were determined using HOPG sample for calibration. Images obtained on clen Au substrate revealed that the surface was not uniform but was composed from flat crystallites having {111} surfaces. For DCT/Au samples a (√3 x √3) R30° reconstruction of molecules was detected. In this case, electron tunneling was pesumed to occur between the microscope itp and gold-bound uslfur atom of DCT molecule. Depressions with a diameter of 40÷150 Å and a depth of approximately 2.4 Å were observed on otherwise flat surface of DCT monolayer. Our results support hypothesis that defects are formed by removal of Au atoms that takes place during monolayer formation when the substrate is immersed in ethanol solution.