Resonance Modes at Defects in Crystalline Quartz

Castle, J. G.; Feldman, D. W.

doi:10.1103/physrev.137.a671

Cited by 41 publications

(32 citation statements)

References 6 publications

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“…Mathematical expressions for the temperature dependence of spin-lattice relaxation are taken from the following references: Raman process (23,24), local mode (25), and Orbach process (26). Equation [1] includes the Orbach process for the middle Kramers' doublet (⌬ Orb ϭ 2D) and the upper Kramers' doublet (⌬ Orb2 ϭ 6D) of the high-spin heme.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electron Spin–Lattice Relaxation Rates for High-Spin Fe(III) Complexes in Glassy Solvents at Temperatures between 6 and 298 K

Zhou

Bowler

Eaton

2000

Journal of Magnetic Resonance

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Section: Experimental Methodsmentioning

confidence: 99%

Electron Spin–Lattice Relaxation Rates for High-Spin Fe(III) Complexes in Glassy Solvents at Temperatures between 6 and 298 K

Zhou

Bowler

Eaton

2000

Journal of Magnetic Resonance

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“…Mathematical expressions for the temperature dependence of spin-lattice relaxation are taken from the following references: Raman process [15,16], local mode [17], Orbach process [18], and thermally activated process [19].…”

Section: Methodsmentioning

confidence: 99%

Frequency dependence of electron spin relaxation for threeS = 1/2 species doped into diamagnetic solid hosts

et al. 2001

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Electron spin lattice relaxation rates (1/T1 ) were measured as a function of temperature at two or three microwave frequencies for three S = 1/2 species in temperature ranges with different dominant relaxation processes. Between 10 and 50 K the contribution from the direct process to the relaxation rate was substantially greater at 94 than at 9.5 GHz for a vanadyl porphyrin doped into zinc tetratolylporphyrin. For bis(diethyldithiocarbamato)copper(TI) doped into the diamagnetic Ni(II) analog the relaxation rate between 25 and 100 K is dominated by the Raman process and exhibits little frequency dependence between 9.2 and 94 GHz. For 4-hydroxy-2,2,6,6-tetramethylpiperidinoloxy (tempol) doped into a diamagnetic host the relaxation rate between about 40 and 100 K is dominated by the Raman process. In this temperature range, relaxation rates at 3.2, 9.2, and 94 GHz exhibit little frequency dependence. Above about 130 K, the relaxation rate for tempol decreases in the order S-band > X-band > W-band. The relaxation rates in this temperature range fit a model in which ]IT, is dominated by a thermally activated process that is assigned as rotation of the methyl groups on the nitroxyl ring.

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“…The expressions for the relaxation processes are described in the following references: Raman process (Murphy, 1966), local mode (Castle and Feldman, 1965a), Orbach process (Orbach, 1961), and thermallyactivated process (Atsarkin et aI., 1997).…”

Section: Fitting Experimental T 1 Datamentioning

confidence: 99%

Relaxation Times of Organic Radicals and Transition Metal Ions

Eaton

2002

Biological Magnetic Resonance

155

165

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Abstract:Review of electron spin relaxation times for organic radicals and transition metal ions in magnetically dilute samples. Emphasis is placed on studies that have been performed as a function of temperature and that provide insight into the relaxation processes. INTRODUCTION Scope of this ChapterMost of the methods for determining distances between spins (ch.l) are either experimentally feasible or theoretically applicable for a limited range of electron spin relaxation times. For example, analysis of the dipolar contribution to the CW line shape to determine interspin distance requires that the relaxation rate for the interacting partner is slow enough that the dipolar splitting is not collapsed by electron spin relaxation. In addition, analysis of the line shapes assumes that spectra are obtained under nonsaturating conditions and are free from passage effects. Application of methods based on changes in relaxation times requires that the relaxation rate of the interacting partner fall within certain limits. The longest distance that can be obtained by pulsed techniques is limited, in principle, by the relaxation-determined width of an individual spin packet. Thus, knowledge of electron spin relaxation times is foundational to the methodologies presented in this book.

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Resonance Modes at Defects in Crystalline Quartz

Cited by 41 publications

References 6 publications

Electron Spin–Lattice Relaxation Rates for High-Spin Fe(III) Complexes in Glassy Solvents at Temperatures between 6 and 298 K

Electron Spin–Lattice Relaxation Rates for High-Spin Fe(III) Complexes in Glassy Solvents at Temperatures between 6 and 298 K

Frequency dependence of electron spin relaxation for threeS = 1/2 species doped into diamagnetic solid hosts

Relaxation Times of Organic Radicals and Transition Metal Ions

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