Fig. 3

(a) A Fourier transformed TF-µSR spectrum of a 0.060 M THF solution of 1 that was exposed to a beam of µ⁺ at 309 K in a 0.86 T transverse magnetic field. A strong diamagnetic resonance of muon (v_µ) appears at 117 MHz, and one pair of paramagnetic signals v₁₂ and v₄₃ means A_µ = 306.472 ± 0.010 MHz. The paramagnetic signal v₄₃ is small because of the time resolution of the spectrometer. The peak at 0 MHz marked with * is an artefact due to the Fourier transform. (b) The v₁₂ signal in the Fourier transformed TF-µSR spectra of a 0.060 M THF solution of 1 in a 0.86 T transverse magnetic field as a function of temperature. The inset graph shows the temperature dependence of the amplitude of the v₁₂ signal determined from fits in the time domain.