The Spin Mixing Process of a Radical Pair in Low Magnetic Field Observed by Transient Absorption Detected Nanosecond Pulsed Magnetic Field Effect

Miura, Tomoaki; Maeda, Kiminori; Arai, Tatsuo

doi:10.1021/jp056488d

Cited by 38 publications

(76 citation statements)

References 31 publications

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“…A MARY spectrum is essentially a conventional stationary magnetic field effect (MFE) curve, the dependence of the yield of recombination fluorescence from radical ion pairs in irradiated solutions on extemal static magnetic field, with sharp lines in zero and low field due to the degeneracy of the spin energy levels of ttle pair. Similar techniques have also been implemented by other groups [9][10][11][12][13][14][15]. To amplify the weak and narrow MARY lines against the slowly changing background of the MFE, magnetic field modulation with lock-in detection of the signal and symmetric passage through zero of the field is used, producing a first-derivative experimental spectrum resembling CW ESR lines.…”

Section: Methodsmentioning

confidence: 99%

Specific MARY spectrum from radical anion of pentafluorobenzene

et al. 2006

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The paper presents the first resolved experimental magnetically affected reaction yield (MARY) spectrum for a system with nonequivalent nuclei, radical anion of pentafluorobenzene. This observation dispels the common apprehension that because of a rather involved energy level layout a system with not all nuclei magnetically equivalent cannot produce resolved MARY lines in nonzero fields, and greatly increases the practical scope of level-crossing techniques for studies of spin-correlated radical pairs. The experimental finding is supported by schemes of energy levels calculated for this system.

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Section: Methodsmentioning

confidence: 99%

Specific MARY spectrum from radical anion of pentafluorobenzene

et al. 2006

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“…6) are substantially larger: around 10-12 mT for both proteins. Discrepancies of this kind occur quite commonly for radical-pair reactions and have often been attributed to electron spin-decoherence within the radical pair (see below) (32,33). Also visible in Fig.…”

Section: Figmentioning

confidence: 96%

Magnetically sensitive light-induced reactions in cryptochrome are consistent with its proposed role as a magnetoreceptor

Maeda

Robinson

Henbest

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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309

480

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Among the biological phenomena that fall within the emerging field of “quantum biology” is the suggestion that magnetically sensitive chemical reactions are responsible for the magnetic compass of migratory birds. It has been proposed that transient radical pairs are formed by photo-induced electron transfer reactions in cryptochrome proteins and that their coherent spin dynamics are influenced by the geomagnetic field leading to changes in the quantum yield of the signaling state of the protein. Despite a variety of supporting evidence, it is still not clear whether cryptochromes have the properties required to respond to magnetic interactions orders of magnitude weaker than the thermal energy, k B T . Here we demonstrate that the kinetics and quantum yields of photo-induced flavin—tryptophan radical pairs in cryptochrome are indeed magnetically sensitive. The mechanistic origin of the magnetic field effect is clarified, its dependence on the strength of the magnetic field measured, and the rates of relevant spin-dependent, spin-independent, and spin-decoherence processes determined. We argue that cryptochrome is fit for purpose as a chemical magnetoreceptor.

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“…A radical pair (RP) model, comprising photo-excited unpaired spins along with an anisotropic hyperfine interaction, has been proposed as a possible mechanism [12][13][14][15]. This kind of a model is supported both by spin chemistry findings [16][17][18][19] and by behavioral experiments on certain bird species, e.g. the European Robin [11,13,20,21].…”

Section: Introductionmentioning

confidence: 99%

State transitions and decoherence in the avian compass

Poonia

Saha

2015

Phys. Rev. E

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The radical pair model has been successful in explaining behavioral characteristics of the geomagnetic compass believed to underlie the navigation capability of certain avian species. In this study, the spin dynamics of the radical pair model and decoherence therein are interpreted from a microscopic state transition point of view. This helps to elucidate the interplay between the hyperfine and Zeeman interactions that enables the avian compass, and the distinctive effects of nuclear and environmental decoherence on it. Using a quantum information theoretic quantifier of coherence, we find that nuclear decoherence induces new structure in the spin dynamics without materially affecting the compass action; environmental decoherence, on the other hand, completely disrupts it.

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The Spin Mixing Process of a Radical Pair in Low Magnetic Field Observed by Transient Absorption Detected Nanosecond Pulsed Magnetic Field Effect

Cited by 38 publications

References 31 publications

Specific MARY spectrum from radical anion of pentafluorobenzene

Specific MARY spectrum from radical anion of pentafluorobenzene

Magnetically sensitive light-induced reactions in cryptochrome are consistent with its proposed role as a magnetoreceptor

State transitions and decoherence in the avian compass

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