Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: P2: Organic Electronics and Photovoltaics

CPP 30.1: Poster

Dienstag, 17. März 2015, 14:00–16:00, Poster B

NMR of ¹²⁹Xe and ¹³C or ³¹P - Construction of a UHV Compatible Double Resonance Probe — •Lars Kraft, Alexander Potzuweit, Anuschka Schaffner, and Heinz Jänsch — FB Physik, Philipps Universität Marburg, 35032 Marburg

The goal of the current project is the investigation of internal atomic layers by NMR techniques. As conventional NMR is by far not sensitive enough to address few layers of semiconductor material grown on a substrate, the sensitivity must be enhanced by 3 to 5 orders of magnitude. This can be achieved by dynamic nuclear polarization (DNP), i.e. the transfer of polarization from a hyperpolarized ¹²⁹Xe film to possible probe nuclei like ³¹P or ¹³C.

Here we describe the technical development of an NMR probe simultaneously resonant to two different kinds of nuclei in an UHV environment which is necessary for DNP. The idea is to extend the existing probe by coupling a second circuit that provides the additional resonance frequency leaving the present UHV setup unchanged. The main task is to match the signal and power transmission between the probe and the spectrometer.

The DNP process is most efficient at close contact. Therefore a ¹³C graphene substrate may be a first material investigated. For an internal ³¹P layer inside a heterostructure the substrate must contain the layer within a few atomic distances from the surface.

Supported by DFG und GRK 1782.