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. 2024 Dec 30;15:10763. doi: 10.1038/s41467-024-54989-2

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 4 — Spin-lattice relaxation rates (1/T₁) of a MgHOTP and b TiHOTP acquired at various temperatures and their fitting results based on Eq. 1. Circles represent experimental data. Red solid lines represent overall fits. Purple dash lines represent contributions from direct processes. Light blue dot lines represent contributions from the local-mode process driven by the 24 cm⁻¹ optical phonon for MgHOTP or the Raman process for TiHOTP. Orange dash-dot lines represent contributions from local-mode processes driven by C−O stretches in semiquinone moieties.