...Fig. 6. Comparison of experimental and simulated ESEEM spectra at 25 K at a rotation angle of 76° (𝛉 = 76.1° and φ = 45.4°). The top simulation assumes a single set of two inequivalent H 2 O protons while the lower simulation includes two sets for each of the two inequivalent H 2 O protons. ...

...Fig. 7 Stacked plots of the 11 B and 10 B portion of the experimental and simulated three-pulse, Fourier-transform ESEEM spectra of Centers I and II in danburite as a function of rotation angles. Intensity in the vertical axis unlabelled (arbitrary unit). ...

...Figure 12 Stacked plots of the 1 H portion of the experimental and simulated three-pulse, Fourier-transform ESEEM spectra as a function of rotation angles. Spectral simulations included eight H nuclei. Intensity in the vertical axis unlabeled (arbitrary unit; modified from Mao et al. 2010b ). ...

... of the synthetic analogue of tetrahedrite (Cu 12 Sb 4 S 13 ), Di Benedetto et al. (unpublished data) performed both EEPR and ESEEM experiments to facilitate the interpretation of cw-EPR spectra. The decay of the echo signal ( Fig. 5a ) is due to two different spin-spin and spin-lattice mechanisms. The difference...

... amplifier was used. Because Mims ENDOR gives rise to blind-spots that originate from an oscillating τ dependence, ENDOR spectra were also recorded as a function of τ and subsequently summed together. Sets of CW-EPR and pulsed ENDOR (and ESEEM) spectra were obtained for one plane whose normal is ~30...

... analyses yield an average iron content of 0.053(34) wt% Fe 2 O 3 ; single-crystal XRD intensity datasets confirm the space group P 2 cm . Single-crystal EPR spectra measured from 290 to 13 K reveal at least six paramagnetic defects: three Fe 3+ centers, a VO 2+ radical, a Mn 2+ center, and an Al-associated...

... in previous X-band (∼9.4 GHz) EPR studies ( Table 1 ). Moreover, our multifrequency EPR spectra, together with results from pulsed electron nuclear double resonance (ENDOR) spectroscopy, electron spin echo envelope modulation (ESEEM) spectroscopy, and density functional theory (DFT) calculations, provided...

... spectra of as-is stishovite reveal two high-spin (S = 3/2) Cr 3+ centers: one with D 2 h symmetry and another of triclinic symmetry. Quantitatively determined spin Hamiltonian parameters, including matrices g , D , and A ( 53 Cr) and high-spin Zeeman term BS 3 , suggest that the D 2 h center represents...

... are 27.2° and 25.4° for the [AlO 4 /H + (a > )] 0 and [AlO 4 /H + (a < )] 0 defects respectively. These angles are about 10° smaller that those deduced from the polarized IR spectra ( Pankrath, 1991 ), which suggested two OH orientations with angles at ∼36° and 34°. However, the difference of about...

...Baoqun Hu; Yuanming Pan; Sanda Botis; Brett Rogers; Tom Kotzer; Gary Yeo Abstract Room-temperature powder electron paramagnetic resonance (EPR) spectra of drusy quartz (i.e., euhedral quartz crystals as coatings on or infillings in cavities and fractures) from five uranium mineralized areas...

...Leo K. L. Cheung; Cameron Mackay; James Sykes; Yuanming Pan Abstract Quartz grains from the ACKIO uranium prospect, located near the eastern margin of the Athabasca Basin, Saskatchewan, have been investigated using powder X-band electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra...

... paramagnetic resonance (EPR) spectroscopy as well as cathodoluminescence (CL) imaging and spectroscopy. Powder EPR spectra confirm that quartz from the Arrow deposit contains a suite of radiation-induced defects, including characteristic silicon vacancy hole centers formed from bombardment of α particles...