Test studies of some conventional CW EPR spectrometer settings

Ivanova, Maria I.

doi:10.1007/bf03162499

Cited by 14 publications

(5 citation statements)

References 9 publications

(10 reference statements)

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“…The contribution of OCIO diffusion into the irradiated zone of the cavity from solution portions which are detected with less sensitivity [30,31] seems to be particularly important in the case of the flat cell WG-813. In contrast, the whole sample in the cylindrical cell is irradiated and it is reproducibly positioned in the middle of the cavity (Fig.…”

Section: R E S U L T S a N D Discussionmentioning

confidence: 99%

Determination of differential quantum yields in solution by electron paramagnetic resonance spectroscopy

2002

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Quantitative kinetic studies on the photochemistry of paramagnetic species in solution may be carried out by electron paramagnetic resonance (EPR) spectroscopy. A cylindrical cell can be used as photochemical reactor, but the internal diameter should be less than 1.7 mm in order to achieve the resonance of an aqueous sample in an X-band (9-10 GHz ) spectrometer. In this paper we present a detailed analysis of the fractions of incident light that are reflected, transmitted and absorbed by a liquid solution in a quartz cylindrical cell placed in the optical cavity of ah X-band EPR spectrometer. Since the photolysis cell is irradiated perpendicularly to its axis, variable angles of incidente have been considered to calculate the transmission and reflection coefficients from Fresnel equations. Polarization of light has been also taken into account in the evaluation of the coefficients. The procedure proposed here is adequate for the evaluation of the absorbed light in the determination of quantum yields. The continuous photolysis at 366 nm of symmet¡ chlorine dioxide (OC10) in aqueous solution was considered as an example. The initial differential quantum yield obtained for OC10 photodecomposition in aqueous solution was I• ~--0.55___0.04.

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Section: R E S U L T S a N D Discussionmentioning

confidence: 99%

Determination of differential quantum yields in solution by electron paramagnetic resonance spectroscopy

2002

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“…The homogeneity of the mixture was checked with reflection spectroscopy [8] anda weighed sample of it was placed in a quartz capillary tube (in a 40 mm high column) and used for calibrating the dependence of the intensity of the EPR response versus the weight of the carbonaceous sample. For this purpose the gain of the EPR 100 kHz amplifier was set at different values (it was checked in advance that the settings of the amplifier gain of the used EPR spectrometers was linear [9]). In order to overcome corrections due to the microwave "focusing" effect of the wide diameter of the sample tubes [10] the quartz capillary was fixed along the axis of the pipe in which the measurements of the filters was performed, The calibration dependence thus obtained was checked using other samples with known content of the active substance.…”

Section: Methodsmentioning

confidence: 99%

EPR study of aerosols with carbonaceous products in the urban air

Veleva

Christov

1996

Appl. Magn. Reson.

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The method of EPR spectroscopy is applied for the first time in the systematic quantitative estimations of earbonaceous solids presentas aerosols in the urban air. The quantitative data obtained are in concert with the estimations using other conventional methods, The advantage of the EPR method in such estimations is that itis not destructive, exhibit selectivity only to paramagnetie species wh~ch are in fact the pyrolyzed produr and not to other polycyclic aromatic hydrocarbons, the anaiyses ate simple, time saving and [nexpensive.

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“…Lineshape analysis of electron spin resonance (ESR) spectroscopy has been applied to determine the concentration of paramagnetic impurities. Although high precision of the spin concentration determination (∼ 3 %) has been achieved at X-band ESR spectroscopy 24 , the method remains challenging for wide applications as it highly depends on the choice of the reference sample 25 , position of the samples in the cavity 26,27 , spin relaxations 28 and requires precise knowledge of effect of samples on microwave fields 29,30 , filling 25,30 and quality factors of the cavity 25,29 , microwave and modulation field distributions over the sample volume [31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

Determination of nitrogen spin concentration in diamond using double electron-electron resonance

Stepanov

Takahashi

2016

Phys. Rev. B

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Diamond has been extensively investigated recently due to a wide range of potential applications of nitrogen-vacancy (NV) defect centers existing in a diamond lattice. The applications include magnetometry and quantum information technologies, and long decoherence time (T 2) of NV centers is critical for those applications. Although it has been known that T 2 highly depends on the concentration of paramagnetic impurities in diamond, precise measurement of the impurity concentration remains challenging. In the preset work, we show a method to determine a wide range of the nitrogen concentration (n) in diamond using a wide-band high-frequency electron spin resonance and double electron-electron resonance spectrometer. Moreover, we investigate T 2 of the nitrogen impurities and show the relationship between T 2 and n. The method developed here is applicable for various spin systems in solid and implementable in nanoscale magnetic resonance spectroscopy with NV centers to characterize the concentration of the paramagnetic spins within a microscopic volume.

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Test studies of some conventional CW EPR spectrometer settings

Cited by 14 publications

References 9 publications

Determination of differential quantum yields in solution by electron paramagnetic resonance spectroscopy

Determination of differential quantum yields in solution by electron paramagnetic resonance spectroscopy

EPR study of aerosols with carbonaceous products in the urban air

Determination of nitrogen spin concentration in diamond using double electron-electron resonance

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