Relaxation processes in a multilevel spin system investigated by linewidth analysis of the multifrequency high-frequency EPR spectra

Martinelli, Massimo; Massa, C. A.; Pardi, Luca; Bercu, Vasile; Popescu, F. F.

doi:10.1103/physrevb.67.014425

Cited by 9 publications

(11 citation statements)

References 25 publications

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“…However, as shown in Fig. 3 15 (see also the Appendix). For any N i ,  1 corresponding to the energy E C Áˇhas all the coefficients c ij > 0.…”

Section: Liquid Helium Temperaturementioning

confidence: 85%

“…Thus the spin-spin relaxation rate, or the dephasing rate T 2 1 , has a spin-spin contribution and a spin-lattice contribution T 1 1 due to the population decay rates. 17 In the optical case, the last contribution is usually much larger than the first, so that T 2 D T 1 . In paramagnetic spin systems at low temperatures, the first contribution is much larger than the second, so that T 2 − T 1 .…”

Section: The Relaxation Contribution To the Lineshape And Intensity Amentioning

confidence: 98%

“…16 The second excited band, at approximately 2g B B above the ground state, corresponds to quasidelocalized spin projections. 15 This band is formed by all the isolated ion states in which two among the NN ions are in the ( 7/2, 3/2), or ( 3/2, 7/2), or ( 5/2, 5/2) states, while all the other ions in the chain have the spin projection state -7/2. The above three isolated spin states are only quasidegenerate because, e.g.…”

Section: Liquid Helium Temperaturementioning

confidence: 99%

“…2 On the other hand, the Gaussian contribution is not simply added to the Lorentzian contribution. 17 That is why the simulation of the lineshape and intensity of the EPR transitions in the presence of the spin projection delocalization effect is difficult. 15 However, since by decreasing the temperature and increasing the frequency N increases strongly, the Lorentzian contributions to the linewidth must increase too.…”

Section: The Relaxation Contribution To the Lineshape And Intensity Amentioning

confidence: 99%

“…17 That is why the simulation of the lineshape and intensity of the EPR transitions in the presence of the spin projection delocalization effect is difficult. 15 However, since by decreasing the temperature and increasing the frequency N increases strongly, the Lorentzian contributions to the linewidth must increase too. This fact can explain the H/T effect concerning the lineshape and intensity of the HF-EPR transitions due to the delocalization of spin projection.…”

Section: The Relaxation Contribution To the Lineshape And Intensity Amentioning

confidence: 99%

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Delocalization of spin projection in weak exchange linear chains, evidenced by multi-frequency HF-EPR spectroscopy

et al. 2005

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High-field electron paramagnetic resonance (HF-EPR) spectroscopy was used to investigate the unusual temperature and frequency dependence of the powder spectrum of the Gd(HBPz3)2 tropolonate complex (GdTrp). A new type of H/T effect is evidenced. This effect is interpreted in terms of the formation of spin projection states delocalized and quasidelocalized along linear chains of Gd3+ ions in high magnetic fields due to the competition between the weak dipole and exchange spin-spin interaction and the particular structure of the molecular complex. The number of ions in the chain depends strongly on the orientation of the magnetic field and on the relaxation processes.

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“…However, as shown in Fig. 3 15 (see also the Appendix). For any N i ,  1 corresponding to the energy E C Áˇhas all the coefficients c ij > 0.…”

Section: Liquid Helium Temperaturementioning

confidence: 85%

Section: The Relaxation Contribution To the Lineshape And Intensity Amentioning

confidence: 98%

Section: Liquid Helium Temperaturementioning

confidence: 99%

Section: The Relaxation Contribution To the Lineshape And Intensity Amentioning

confidence: 99%

Section: The Relaxation Contribution To the Lineshape And Intensity Amentioning

confidence: 99%

See 3 more Smart Citations

Delocalization of spin projection in weak exchange linear chains, evidenced by multi-frequency HF-EPR spectroscopy

et al. 2005

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Multifrequency Electron Spin‐Relaxation Times

Eaton

2011

Multifrequency Electron Paramagnetic Resonance

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Glassforming Liquids, Amorphous and Semicrystalline Polymers: Exploring their Energy Landscape and Dynamical Heterogeneity by Multi-frequency High-Field EPR

et al. 2020

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We review past and recent work carried out on viscous liquids, amorphous and semicrystalline polymers by multifrequency high-field electron paramagnetic resonance (HF-EPR) facility in Pisa. The emphasis is on the enhanced ability to provide fine details of the reorientation process of the paramagnetic guest, the spin probe, revealing features driving the dynamics of the host system, including the energy-barrier distribution of glassy polymers, the dynamical heterogeneity of semicrystalline polymers, and the dynamical changes occurring at the critical temperature predicted by the ideal mode-coupling theory.

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Relaxation processes in a multilevel spin system investigated by linewidth analysis of the multifrequency high-frequency EPR spectra

Cited by 9 publications

References 25 publications

Delocalization of spin projection in weak exchange linear chains, evidenced by multi-frequency HF-EPR spectroscopy

Delocalization of spin projection in weak exchange linear chains, evidenced by multi-frequency HF-EPR spectroscopy

Multifrequency Electron Spin‐Relaxation Times

Glassforming Liquids, Amorphous and Semicrystalline Polymers: Exploring their Energy Landscape and Dynamical Heterogeneity by Multi-frequency High-Field EPR

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