Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.57: Poster
Monday, September 5, 2022, 18:00–20:00, P1
Optically Detected Magnetic Resonance (ODMR) studies on Pentacene doped p-Terphenyl microcrystals — •Dominik Winter1, Björn Ewald1, and Jens Pflaum1,2 — 1Experimental Physics VI, University of Würzburg, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
The characteristic wavefunctions of the pentacene triplet states offer the possibility to maintain an asymmetric occupation of the various sublevels even at room temperature. Exposing pentacene single molecules embedded in a crystalline environment to microwaves of suited frequency, a controlled variation in population of the resonant triplet states can be achieved and optically detected - a technique termed optically detected magnetic resonance (ODMR). Here we report on our first results on the triplet polarization of pentacene doped p-terphenyl microcrystals prepared by microspacing in-air sublimation (MAS). By means of zero-field ODMR we analyze the microwave-induced transitions between the contributing triplet states. We will demonstrate and evaluate how the fast and easy method of MAS provides microcrystals that show an enhanced nuclear spin polarization. This process of triplet-induced dynamic nuclear polarization (DNP), is considered a potential approach to enhance the nuclear spin polarization of water and, thus, to significantly improve the image contrast of magnetic resonance imaging (MRI) as well as the sensitivity of non-invasive methods for structural characterization [1].
[1] K. Nishimura et al., Phys. Chem. Chem. Phys., 2019,21, 16408-16412