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Ацаркин, В. А.; Демидов, В. В.; Vasneva, G. A.; Fehér, Titusz; Jànossy, A.; Da̧browski, B.

doi:10.1103/physrevb.61.r14944

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…For the measurement of faster relaxing paramagnetic systems, longitudinally detected (LOD) EPR methods can be useful. [3][4][5][6] Recently, we published an account of the application of LODEPR for the measurement of T 1e in aqueous solutions of Gd 3+ chelates at an experimental frequency of 9.5 GHz (X band), where the observed longitudinal relaxation times varied between 1.7 and 4.0 ns. 7 In that account, we described a calculation of T 1e values based on zero field splitting (ZFS) parameters evaluated from cw multifrequency EPR spectra of the compounds.…”

Section: Introductionmentioning

confidence: 99%

T₁_e in Four Gd³⁺ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

et al. 2002

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In a previous paper, we reported the first longitudinally detected electron paramagnetic resonance (LODEPR) measurements of fast T 1e values in aqueous solutions of two Gd3+ chelates, and we included predicted values for these relaxation times, based on zero field splitting (ZFS) parameters derived from multifrequency EPR data on the two systems [Atsarkin, V. A.; Demidov, V. V.; Vasneva, G. A.; Odintsov, B. M.; Belford, R. L.; Radüchel, B.; Clarkson, R. B. J. Phys. Chem. 2001, 105, 9323−9327]. The model used in that analysis was derived from the original work of Hudson and Lewis and did not explicitly consider the static and dynamic parts of the ZFS. A more comprehensive model for relaxation in these S = 7/2 systems has been recently published. Here, we reexamine the multifrequency data in light of this new model, recalculate the ZFS parameters, and calculate new predictions for T 1e, which much more closely agree with experimental values. Additionally, the LODEPR T 1e values for two standard chelates, [Gd(DOTA)(H2O)]- and [Gd(DTPA)(H2O)]2- are reported, together with predicted relaxation times. Both the importance of the new model and the validity of the LODEPR values are strengthened by these data.

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Section: Introductionmentioning

confidence: 99%

T₁_e in Four Gd³⁺ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

et al. 2002

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“…The problem of measuring short T 1e values can be addressed by using a modulation technique suggested originally by Hérve and Pescia 2,3 and recently modified by Atsarkin et al , The method is described in section 2. Section 3 shows the application of the technique in the measurement of T 1e in water solutions of the 15 N -perdeuteriotempone (PDT) radical.…”

Section: Introductionmentioning

confidence: 99%

Direct Measurement of Fast Electron Spin−Lattice Relaxation: Method and Application to Nitroxide Radical Solutions and Gd³⁺ Contrast Agents

et al. 2001

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A modulation technique for direct measurement of extremely fast electron spin-lattice relaxation is described. The method is based on longitudinal magnetization detection. It is applied here to study the spin-lattice relaxation times T 1e in aqueous solutions of perdeuterated nitroxide radical (T 1e ≈ 200 ns) with various concentrations as well as to two Gd DOTA complexes (T 1e ≈ 1.8-3.2 ns), which can be employed as paramagnetic contrast agents in magnetic resonance imaging.

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“…Unlike this, the relaxation rate of the total longitudinal magnetization of the sspins is equal to TIc-~ = T~ l + T~ t and so does not depend on M. Thus, ir the partial spin-lattice relaxation rate of the s-spins can be neglected, the following relation takes place: -1 -1 T2eer/Tl~ff = S(S + 1)-M(M + 1). Such a relation between the relaxation rate T~~-~ measured by the modulation longitudinal method and the homogeneous parts of the linewidths of the resolved FS components was observed experimentally in the normal phase of Y0.99Gd0.01Ba2Cu306+x [14] and superconducting phase of Y0.99Gd0.0q [15]. In both cases, the localized (s-) spins were represented by Gd 3+ ions (S = 7/2).…”

Section: Discussion and Comparison With Experimental Datamentioning

confidence: 88%

“…(~c -co+)(O~c -co-)(~c -co5 + 2coq) + co2(~ c -co 0 = 0, (15) where co_+ ate the characte¡ roots of the usual Bloch-Hasegawa equations for spin S = 1/2. Assuming equal g-factors of s-and e-spins and purely relaxational coupling between them, the expression for co_+ reads: 2I + " +r +4co~'co~' I-co o +icoŸ…”

Section: Relaxational Collapse Of the Fine Structurementioning

confidence: 99%

ESR and longitudinal response in metals containing localized paramagnetic centers with spinS>1/2

2003

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The theory deseribing electron spin resonance (ESR) and the longitudinal magnetization response of coupled spin systems in a metal eontaining both delocalized conduction electrons ("espins") and localized paramagnetic eenters ("s-spins") is generalized to the case of arbitrary halfinteger spin value, S > 1/2, of the s-spins. The consideration is based on the Bloch-Hasegawa equations supplemented by taking into account the coupled evolution of the longitudinal magnetization components and the effect of weak ESR saturation by the microwave field. The ESR transversal susceptibility and longitudinal magnetization response are worked out in terms of normal modes related to the coupled s-and e-spin oseillators taking into account the ESR fine strueture (FS) of the sspins. These modes are characterized by effeetive (renormalized) frequencies and relaxation rates (deeays) which differ from the partial ones. In the specific cases of a well-resolved FS (in the isothermal limit) and of the relaxational collapse of the FS due to strong exchange coupling between the s-and e-spins (in both the isothermal and bottleneeked limits), the analytieal expressions are de-¡ which ate relevant to the modulation technique of measuring extremely fast spin-lattice relaxation times in metals.

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Electron spin-lattice relaxation rate inY(Gd)Ba2Cu4

Cited by 10 publications

References 21 publications

T₁_e in Four Gd³⁺ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

T₁_e in Four Gd³⁺ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

Direct Measurement of Fast Electron Spin−Lattice Relaxation: Method and Application to Nitroxide Radical Solutions and Gd³⁺ Contrast Agents

ESR and longitudinal response in metals containing localized paramagnetic centers with spinS>1/2

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Electron spin-lattice relaxation rate inY(Gd)Ba2Cu4

Cited by 10 publications

References 21 publications

T1e in Four Gd3+ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

T1e in Four Gd3+ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

Direct Measurement of Fast Electron Spin−Lattice Relaxation: Method and Application to Nitroxide Radical Solutions and Gd3+ Contrast Agents

ESR and longitudinal response in metals containing localized paramagnetic centers with spinS>1/2

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T₁_e in Four Gd³⁺ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

T₁_e in Four Gd³⁺ Chelates: LODEPR Measurements and Models for Electron Spin Relaxation

Direct Measurement of Fast Electron Spin−Lattice Relaxation: Method and Application to Nitroxide Radical Solutions and Gd³⁺ Contrast Agents