X-band (9.7 GHz) ESR experiments were undertaken using an ELEXSYS E580 Bruker spectrometer (Bruker Biospin) equipped with a dielectric ring resonator (Bruker EN 4118X-MD4). The samples are mounted in a quartz tube suspended in the center of the resonator, and the ensemble is contained in a flow cryostat (Oxford Instruments CF935) with pumped liquid helium (3.3 K).
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