Abstract
HYperfine Sublevel CORrElation spectroscopy (HYSCORE) is one of the most widely applied EPR techniques for the investigation of hyperfine couplings in a wide range of spin systems; here, it is applied for the first time to a photoexcited triplet state. The analytical expressions describing the electron spin echo envelope modulations in a HYSCORE experiment on a triplet state coupled to spin ½ nuclei and spin 1 nuclei with weak nuclear quadrupole interactions were derived employing the density matrix formalism and used to determine the characteristic features of this experiment when applied to a triplet state. Experimental HYSCORE spectra recorded on the photoexcited triplet state of a meso-substituted zinc porphyrin are used to investigate the 14N hyperfine interactions in this system. The results are compared to one-dimensional three-pulse Electron Spin Echo Envelope Modulation (ESEEM) experiments and the comparison clearly shows the advantage of the HYSCORE experiment for investigation of the hyperfine couplings of a spin 1 nucleus for triplet states in disordered powder samples. The experimental HYSCORE data are discussed and interpreted in light of the properties of triplet state HYSCORE spectra identified using our theoretical approach.
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Acknowledgments
The Q-band EPR measurements were performed at the National EPR Research Facility at the University of Manchester with the help of Dr. Alistair Fielding. The authors are grateful to Dr. Jeffrey Harmer for helpful discussions and useful comments on the manuscript. The authors gratefully acknowledge the financial support of this work by EPSRC. Marilena Di Valentin and Donatella Carbonera express their gratitude to Prof. Giovanni Giacometti for laying the foundations of research on photoexcited states, and in particular on triplet states, at the University of Padova, for introducing them to this research field and his longstanding collaboration and support in their research. This paper is dedicated to him on the occasion of his 85th birthday.
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Appendix
Appendix
List of the coefficients used in Eq. 2 of the main text:
List of the coefficients used in Eq. 9 of the main text:
The remaining coefficients \(\chi\) can be derived from the ones given above by substitution of the frequency indices according to the following table:
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Tait, C.E., Neuhaus, P., Anderson, H.L. et al. HYSCORE on Photoexcited Triplet States. Appl Magn Reson 46, 389–409 (2015). https://doi.org/10.1007/s00723-014-0624-5
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DOI: https://doi.org/10.1007/s00723-014-0624-5