An experimental method for the study of the effects of magnetic and microwave fields on radical recombination reactions

Grant, A.I.; McLauchlan, K.A.; Nattrass, S. R.

doi:10.1080/00268978500101541

Cited by 17 publications

(10 citation statements)

References 25 publications

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“…Similar, but worse, problems are encountered in a pulsed MARY experiment which we have used also for comparison purposes; it is based upon one we described previously [11] but this has been changed greatly in detail and will be the subject of a forthcoming paper. This experiment involves observation of laserinduced fluorescence from radicals produced in excimer laser flashes, which occur alternately with the magnetic field turned on and off.…”

Section: Izf-i Smentioning

confidence: 91%

“…If~g processes control the overall behaviour, or if incoherent spin-relaxation competes with the coherent spin evolution in the RP, saturation behaviour is not observed. A further characteristi9 of the field effect is that, as shown in figure 1, it is expected to exhibit a low-field feature of opposite phase to that observed at higher field; this has been reported rarely in experimental studies [9][10][11]. It can arise in two ways.…”

Section: Introductionmentioning

confidence: 99%

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High resolution studies of the effects of magnetic fields on chemical reactions

Hamilton¹,

Hewitt²,

McLauchlan³

et al. 1988

Molecular Physics

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A simple and inexpensive experiment is described which detects magnetic field effects on chemical reactions with high signal-to-noise ratio and high resolution. It consists in applying a small modulation field to the sample, whilst the main field it experiences is varied, with optical detection at the modulation frequency. It consequently measures the derivative of the normal MARY spectrum. It is shown by theoretical analysis that when using this method it is better to monitor reaction intermediates than products. The method is demonstrated by application to known systems in which additional features are sometimes observed, in particular a low-field feature which is shown to vary as electron hopping occurs. MARY spectra obtained using modulated light excitation of the sample and pulsed excitation with laser-induced fluorescence detection are provided for comparison. The method represents a general technique for studying field effects in systems containing low stationary state concentrations of radicals, produced by any method.

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Section: Izf-i Smentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

High resolution studies of the effects of magnetic fields on chemical reactions

Hamilton¹,

Hewitt²,

McLauchlan³

et al. 1988

Molecular Physics

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“…There are several different RYDMR methods such as fluorescence-detected magnetic resonance (FDMR) [30,31], transient-absorption-detected magnetic resonance (ADMR) [33,34] and recently developed PCDMR [37]. The observation of final reaction products of spin-trapped products constitutes a further RYDMR method [32].…”

Section: Controlling Photochemical Reactionsmentioning

confidence: 99%

“…A novel pulsed EPR technique was also developed to identify the multiplicity of the intermediate RP [29]. Another important field of spin effects, namely, the reaction-yielddetected magnetic resonance (RYDMR) [30,31] started in Japan in 1986 with a remarkable work by Okazaki [32] and developed along with the above mentioned work in MFE, TREPR and pulsed EPR. Recent developments in this field enabled us to control the chemical reactions by microwave (MW) field [33][34][35] and to observe quantum beats [36].…”

Section: Introductionmentioning

confidence: 99%

Developments of magnetic-resonance-related spin chemistry in Japan

et al. 2003

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Abstraet. A review on the developments of the magnetic-resonance-related spin chemistry in Japan is presented. We describe how studies in this atea started in Japan and developed into the flourishing state of the present. Important contributions made by Japanese spin chemists in the last two decades in three areas, namely, work on chemically induced dynamic electron polarization, excited states and controlling of photochemical reactions, are presented. More emphases are placed on the new deveIopments in recent years, particularty new concepts and new methodologies.

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“…Therefore, an object of study has been restricted mainly to the radical ion pairs because the geminate recombination product of the radical pair should be in the excited state. For the general extension of the technique to the reaction systems of the neutral radical pair, the transient optical absorption method of the intermediates is more useful [11]. Therefore, we apply the transient absorption method for the observation of the microwave effect on the dynamics of the radical pair.…”

Section: Introductionmentioning

confidence: 99%

The time-resolved ADMR in the photolysis of the polymethylene-linked system of xanthone and xanthene: Power dependence

Maeda¹,

Araki²,

Enjo³

et al. 1997

Appl. Magn. Reson.

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Abstraet. The time-resolved ADMR (absorption-detected magnetic resonance) spectrum of the polymethylene linked biradical generated in the photolysis of ct-(xanthene-2-carbony!oxy)-co-(xanthene-2-carbonyloxy) dodecane is observed at various microwave power. When the lower microwave power is low, the ADMR spectrum is totally negative (the absorbance of xanthyl radical decreases by the microwave irradiation) and is interpreted in terms of the hyperfine strueture of the terminal radieals. In contrast with this, the ADMR spectrum obtained at high microwave field consists of two eomponents: central component and wing component. The central component is positive and is interpreted in terms of the deceleration of the intersystem crossing by microwave, which is known as the spin locking. The wing component is negative and the linewidth is much larger than that of the central one. Ir is ascribed to the transitions from ]T+~) and IT 1) states to singlet state having a slight IT0) character. It is proposed that the width of the time resolved spectrum is due to the fluctuation of the exchange integral (modulated exehange integral) by the motion of the polymethylene chain. The time dependence of the central and wing components and the conditions for observation of them are discussed.

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An experimental method for the study of the effects of magnetic and microwave fields on radical recombination reactions

Cited by 17 publications

References 25 publications

High resolution studies of the effects of magnetic fields on chemical reactions

High resolution studies of the effects of magnetic fields on chemical reactions

Developments of magnetic-resonance-related spin chemistry in Japan

The time-resolved ADMR in the photolysis of the polymethylene-linked system of xanthone and xanthene: Power dependence

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