Ortsaufgelöste Elektronenspinresonanz (English shop)

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Spatially resolved electron spin resonance provides the central experimental approach in Malte Drescher’s dissertation “Ortsaufgelöste Elektronenspinresonanz.”
The research focuses on developing high-resolution imaging techniques using pulsed electron spin resonance (ESR) in the X-band.
Quasi-one-dimensional organic conductors, particularly the radical cation salts (fluoranthene)₂PF₆ and (pyrene)₁₂(SbF₆)₇, serve as model systems.
Two imaging approaches, Fourier imaging and projection reconstruction, are compared regarding experimental feasibility and image quality.
Under the investigated conditions, projection reconstruction proves more suitable for high-resolution ESR imaging.
Using this technique, a spatial resolution of 10 micrometers is achieved.
Temperature- and time-dependent ESR measurements enable the spatial characterization of various physical properties.
These include electron spin relaxation times, spin diffusion coefficients, ESR susceptibility, and paramagnetic defect concentrations.
Another focus is the investigation of deliberately introduced crystal defects produced through high-energy proton irradiation.
The experiments demonstrate how these defects influence electron spin diffusion and the Peierls transition.
Furthermore, the study successfully demonstrates the detection of conduction-electron drift motion using electron spin resonance.
The findings establish new possibilities for nondestructive investigations of electronic transport processes and microstructural properties in organic conductors.