Improving B1 field homogeneity in dielectric tube resonators for EPR spectroscopy via controlled shaping of the dielectric insert

A Peptide-Based Trap for Metal Ions Studied by Electron Paramagnetic Resonance

“…The first term of the V(T) decay refers to the inter-molecular interaction, where α is 1.64•10 −12 cm 3 /s [38], C is the spin probe concentration, and p B is an excitation parameter, which is calculated from the EPR lineshape and the parameters of the excitation pulse (note that, for a given resonator on a model compound, the experimentally measured modulation depth λ is close to the calculated value (λ exp /λ calc = 0.95) [52]). The second term of the decay results from the intra-molecular interaction, where the function…”

“…Continuous wave (CW) and pulse X-band EPR spectra were acquired using a Bruker Elexsys E580 spectrometer equipped with a cylindrical resonator with a shaped dielectric inset [52]. CW EPR measurements were performed both at room temperature (RT) and at 100 K. At 100 K, the microwave (mw) power was attenuated to −45 and −25 dB when measuring nitroxides and Cu(II) species, respectively, to avoid spectra saturation; at room temperature, the mw power was attenuated to −35 and −25 dB for nitroxides and Cu(II) species, respectively.…”

The Cu(ii) – dietary fibre interactions at molecular level unveiledviaEPR spectroscopy

“…An important parameter in the eqn ( 2) is the fraction of spins inverted by the pump pulse p B , which is determined by length and strength of the mw pulse and by the shape of the EPR spectrum. 48 Since we used the commercial Bruker MS3 resonator with almost uniform B 1 -prole along the sample, 61 the estimated p B values are 0.049 AE 0.003 for Cu(II) in the aqueous solvent and 0.039 AE 0.002 for Cu(II) in the acetic buffer at our experimental conditions. The DEER decays at different dipolar evolution times were measured to test the s 2 lter effect of the decay rate (ESI, Fig.…”

Розробка Та Характеризація Керамічних Вставок В Металеві Резонатори ЕПР Спектрометрів Для Підвищення Їх Чутливості

“…By varying the geometric parameters of the DIs, their optimal values were determined: the outer radius = 2.85 mm, the inner radius = 0.75 mm, and the height ℎ = 1.85 mm. It should be noted that the set of the parameters that can affect the field distribution in the DI includes the outer radius of the middle part of the cylinder: its reduction changes the homogeneity degree of the magnetic microwave field in the inner hole, which is intended for the sample arrangement [22]. However, such a modification gives Fig.…”