Measurement of hyperfine coupling constants of muoniated radicals in small molecule semiconductors

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Schulz, L.^1 ; Wang, K.^1,2 ; Willis, M.^1,2 ; Nuccio, L.^2,3 ; Murahari, P.^2 ; Zhang, S.^1 ; Pratt, F.L.^4 ; Lord, J.S.^4 ; Morley, N.A.^5 ; Bernhard, C.^3 ; Drew, A.J.^1,2,4

Sichuan University, School of Physical Science and Technology, Chengdu, Sichuan

610064, China^1

Queen Mary University of London, Mile End Road, London

E1 4NS, United Kingdom^2

Department of Physics, Fribourg Center for Nanomaterials-Frimat, University of Fribourg, Chemin du Musée 3, Fribourg

1700, Switzerland^3

ISIS Muon Facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot

OX11, United Kingdom^4

Department of Materals Engineering and Science, University of Sheffield, Mappin Street, Sheffield

S1 3JD, United Kingdom^5

关键词: Bonding sites;    Crystal packings;    Hyperfine coupling constants;    Level crossing;    Pentacenes;    Small molecules;    Tetracene;    Transverse field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012042/pdf
DOI  :  10.1088/1742-6596/551/1/012042

来源: IOP

【 摘 要 】

We report the hyperfine coupling constants of muoniated radicals formed in a number of organic semiconductors, via transverse field measurements taken in the Paschen Back limit, and compare the results to avoided level crossing resonances. Five muoniated radicals are found in tetracene, despite there only being three potential non-equivalent bonding sites, and we suggest that this might be down to crystal packing effects. For 6,13-bis(triisopropylsilylethynyl) pentacene and 6,13-bis(trimethlsilylethynyl)-pentacene, we demonstrate that the transverse field data supports the previously published avoided level crossing resonances.