1–370 GHz EPR Linewidths for K3CrO8: A Comprehensive Test for the Anderson–Weiss Model

Cage, Brant; Cevc, P.; Blinc, R.; Brunel, Louis‐Claude; Dalal, Naresh S.

doi:10.1006/jmre.1998.1569

Cited by 20 publications

(14 citation statements)

References 19 publications

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“…This is about an order of magnitude higher than for the ultramarine blue radical, which is consistent with the much larger value of J for DPPH than for ultramarine blue. For K3CrO8 J = 1.35 K and the minimum in line width as a function of frequency occurs at about 100 GHz [35].…”

Section: Resultsmentioning

confidence: 99%

Multifrequency electron paramagnetic resonance of ultramarine blue

et al. 2001

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Electron paramagnetic resonance spectra of the S3 radical center in ultramarine blue over a factor of about 2500 in frequency (258 MHz to 670 GHz) reveal a substantially Lorentzian shape, without resolution of g anisotropy. Variable temperature measurements found that the line width is independent of temperature, within experimental uncertainty, up to about 90 K at 9.5 GHz and between ca. 5 K and room temperature at 95 and 217 GHz, as expected for an exchange-narrowed signal. Analysis of the increase in the low-temperature line width as a function of frequency above 9 GHz is consistent with an exchange interaction of about 2. 10 -2 K. The line width increases as frequency is decreased from 2.7 GHz to 258 MHz which is attributed to the contribution from nonsecular terms that has been denoted the "10/3" effect.

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Section: Resultsmentioning

confidence: 99%

Multifrequency electron paramagnetic resonance of ultramarine blue

et al. 2001

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“…The line intensity increased further as the temperature lowered to 110 K and the signal linewidth was about 40 mT. The large linewidth of the signal is probably due to dipole-dipole broadening [29,30], while experiments performed in the range of temperature 110-300 K did not show any signal for b-Co(OH) 2 . The spectrum of a-Co(OH) 2 is shown in Fig.…”

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

Reaction–diffusion based co-synthesis of stable α- and β-cobalt hydroxide in bio-organic gels

Al-Ghoul

El-Rassy

Coradin

et al. 2010

Journal of Crystal Growth

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“…Recall, however, that XMCD signals of paramagnetic phases were detected so far only under high magnetic bias fields (B 0 ≥ 5T) and at fairly low temperatures (T ≤ 20K): XDEPR spectra should thus be pumped at sub-THz frequencies [25]. For concentrated samples, there is an additional difficulty that the XDEPR lines could be rather broad if the exchange field (H ex ) does not largely exceed the dipolar field (H dd ) since, according to the Anderson-Weiss model for exchange narrowing, H ∝ H 2 dd /H ex [26,27]. XDEPR, nevertheless, could yield some unique information about the precession dynamics of orbital magnetization components in Van Vleck paramagnets that were proposed as polarizing agents for DNP applications [28].…”

Section: Precession Dynamics Of Z and S Z Up To Thz Pump Frequenciesmentioning

confidence: 99%

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

Рогалев

Goulon

Goujon

et al. 2011

J Infrared Milli Terahz Waves

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X-ray Detected Magnetic Resonance (XDMR) is a novel spectroscopy which makes use of X-ray Magnetic Circular Dichroism (XMCD) to probe the resonant precession of local magnetization components in a strong microwave pump field. In Sections 1 and 2, we briefly review the conceptual bases of XDMR and the potential interest of increasing the pumping frequency up to the THz frequency range. In Sections 3-5, we discuss the feasibility of such challenging experiments. Starting from a comparison of experiments carried out either in the transverse (TRD) or longitudinal (LOD) detection geometries, we show that XDMR measurements at sub-THz frequencies require a substantial increase in pumping power: this is where a gyrotron source looks most appropriate. It is the aim of this paper to discuss how to conduct such experiments, emphasis being laid on feasibility tests recently carried out at the ESRF using a refurbished version of Gyrotron FU-II built at the FIR-FU. In this context, we propose a new detection scheme of sub-THz XDMR spectra based on the concept of frequency-mixing in LOD geometry.

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1–370 GHz EPR Linewidths for K3CrO8: A Comprehensive Test for the Anderson–Weiss Model

Cited by 20 publications

References 19 publications

Multifrequency electron paramagnetic resonance of ultramarine blue

Multifrequency electron paramagnetic resonance of ultramarine blue

Reaction–diffusion based co-synthesis of stable α- and β-cobalt hydroxide in bio-organic gels

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

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