Spin dynamics and EPR spectra of consecutive spin-correlated radical pairs. Model calculations

1997 ◽  
Vol 12 (2-3) ◽  
pp. 141-166 ◽  
Author(s):  
Yu. E. Kandrashkin ◽  
K. M. Salikhov ◽  
D. Stehlik
Keyword(s):  
Spin Dynamics ◽  
Epr Spectra ◽  
Radical Pairs ◽  
Model Calculations

Electron Spin Decoherence by Nuclei

2018 ◽  
Author(s):  
M. M. Glazov
Keyword(s):  
Electron Spin ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Host Lattice ◽  
Spin Model ◽  
Relaxation Processes ◽  
Nuclear Spins ◽  
Model Calculations ◽  
Spin Decoherence ◽  
Quantum Mechanical Approach

The discussion of the electron spin decoherence and relaxation phenomena via the hyperfine interaction with host lattice spins is presented here. The spin relaxation processes processes limit the conservation time of spin states as well as the response time of the spin system to external perturbations. The central spin model, where the spin of charge carrier interacts with the bath of nuclear spins, is formulated. We also present different methods to calculate the spin dynamics within this model. Simple but physically transparent semiclassical treatment where the nuclear spins are considered as largely static classical magnetic moments is followed by more advanced quantum mechanical approach where the feedback of electron spin dynamics on the nuclei is taken into account. The chapter concludes with an overview of experimental data and its comparison with model calculations.

Cluster model calculations of oxygen vacancies in SiO2and MgO Formation energies, optical transitions and EPR spectra

1997 ◽  
Vol 106 ◽  
pp. 155-172 ◽  
Author(s):  
Gianfranco Pacchioni ◽  
Anna Maria Ferrari ◽  
and Gianluigi Ieranò
Keyword(s):  
Cluster Model ◽  
Oxygen Vacancies ◽  
Epr Spectra ◽  
Optical Transitions ◽  
Model Calculations ◽  
Formation Energies

A reinterpretation of the EPR spectra of Cu(II) in zeolites A, Y and ZK4, based on ab initio cluster model calculations

2001 ◽  
Vol 3 (11) ◽  
pp. 2174-2183 ◽  
Author(s):  
Kristine Pierloot ◽  
Annelies Delabie ◽  
Marijke H. Groothaert ◽  
Robert A. Schoonheydt
Keyword(s):  
Ab Initio ◽  
Cluster Model ◽  
Epr Spectra ◽  
Model Calculations

Spin dynamics of neutral radical pairs in single crystals of di-tert-butyl-pryrocatechol doped with tetrakis(t-butyl)-phenoxazin

1993 ◽  
Vol 215 (4) ◽  
pp. 375-382 ◽  
Author(s):  
G.G. Lazarev ◽  
V.L. Kuskov ◽  
K. Laukenmann ◽  
A. Angerhofer
Keyword(s):  
Single Crystals ◽  
Spin Dynamics ◽  
Radical Pairs ◽  
Neutral Radical ◽  
Tert Butyl

scholarly journals Radical pairs may play a role in microtubule reorganization

2021 ◽  
Author(s):  
Hadi ZADEH-HAGHIGHI ◽  
Christoph Simon
Keyword(s):  
Magnetic Field ◽  
Radical Pair ◽  
Spin Dynamics ◽  
Radical Pair Mechanism ◽  
Magnetic Field Effects ◽  
Radical Pairs ◽  
Quantum Theories ◽  
Mechanism Model ◽  
Field Effects ◽  
Isotopic Dependence

The exact mechanism behind general anesthesia remains an open question in neuroscience. It has been proposed that anesthetics selectively prevent consciousness and memory via acting on microtubules (MTs). It is known that the magnetic field modulates MT organization. A recent study shows that a radical pair model can explain the isotope effect in xenon-induced anesthesia and predicts magnetic field effects on anesthetic potency. Further, reactive oxygen species are also implicated in MT stability and anesthesia. Based on a simple radical pair mechanism model and a simple mathematical model of MT organization, we show that magnetic fields can modulate spin dynamics of naturally occurring radical pairs in MT. We show that the spin dynamics influence a rate in the reaction cycle, which translates into a change in the MT density. We can reproduce magnetic field effects on the MT concentration that have been observed. Our model also predicts additional effects at slightly higher fields. Our model further predicts that the effect of zinc on the MT density exhibits isotopic dependence. The findings of this work make a connection between microtubule-based and radical pair-based quantum theories of consciousness.

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