ESR study of the I atom in HIO3

Bailey, C.E.

doi:10.1063/1.1680238

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…In the case of I - oxidation, the signal of I • could not be observed in the magnetic field region of this experiment, because the signal becomes too broad in frozen solution. Iodine has the nuclear spin quantum number 5 / 2 , and the g values and hyperfine coupling constants have large anisotropy ( g x = 2.079, g y = 1.987, and g z = 1.944; A x = 32.6 mT, A y = 38.8 mT, and A z = 68.6 mT) …”

Section: Resultsmentioning

confidence: 99%

Electron Spin Resonance Study of Radicals Produced by Photoirradiation on Quantized and Bulk ZnS Particles

Nakaoka

Nosaka

1997

Langmuir

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Quantized ZnS particles were prepared and isolated from aqueous solution with a capping agent, thioglycerol. The absorption peak of the particles was located at 259−260 nm, and the diameter was estimated to be 1.5−1.6 nm from X-ray diffractograms. Their excitation energy agrees well with that calculated with the finite depth potential well model. ESR spectra were measured for the quantized and bulk ZnS particles at 77 K under photoirradiation. For the quantized ZnS, only surface hole radicals were observed, while several kinds of radicals consisting of trapped electron, inner, and surface holes were observed for the bulk ZnS. A high activity of photocatalytic reactions for quantized semiconductor particles may arise from a large number of radicals photoproduced at the surface.

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Section: Resultsmentioning

confidence: 99%

Electron Spin Resonance Study of Radicals Produced by Photoirradiation on Quantized and Bulk ZnS Particles

Nakaoka

Nosaka

1997

Langmuir

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“…This value indicates that the distance between an unpaired electron and a proton is quite long ( A - ( 1 / r 3 ) ) . The authors of [13,141 reported that approximately the same value of the hfs constant for H1 was observed on irradiated HIO, crystals [13, 141. In a LiIO, crystal the hydrogen atoms can be located in the nearest to 10:interstitial sites and in structure vacancies. Each line of the doublet probably consists of four lines (Fig.…”

Section: Hf Interactionmentioning

confidence: 87%

“…For the 10,Hcentre which is an analog of IO,F- [17] or IOH- [18], the g-factors should be greater than the free-spin value and the hfs constant from 1127 should be smaller and shfs constant from H1 should be much greater than the observed values. It is necessary to exclude the possibility of 10; or 1' formation [13] because these centres should have a hole nature. Thus, iiiost likely is the forniation of the 27-electron 10;centre with charge compensation by Fe3+ ions.…”

Section: Identification Of the Centrementioning

confidence: 99%

ESR study of the paramagnetic 10 centre in an α‐LiIO₃ crystal

Martirosyan¹,

Meilman²,

Marov³

et al. 1975

Physica Status Solidi (b)

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V. 0. MARTIROSYAK e t al.: ESR Study of the Paramagnetic 10:-Center in a-LiI0, 791 phys. stat. sol. (b) 68, 791 (1975) Subject classification: 19; 22.8 Erevan State University ( a ) and V . I . Vernadskii Institute of Geochemistry and Analytical Chemistry, Academy of Sciences of the USSR, Moscow ( b ) ESR Study of the Paramagnetic 10;-Centre in an a-LiIO, Crystal BY V. 0. MARTIROSYAN (a), M. L. MEILMAN (b), I. N. MAROV (b), and V. V. SHUKOV (b) In crystals of a polar phase of cc-LiIO, a n ESR spectrum a t a frequency of v = 34.633 GHz and T = 290 OK is observed. The spectrum consists of t,wo sextets. Each line of the sextet splits into a doublet and a multiplet. The spectrum is attribut,ed to two centres of 10;with an equivalent structure. It is shown that a 27-electron centre, IO",, is formed from 10, ions under y-irradiation. The charge compensation is based on the oxidation of Fez+ present in crystals as an impurity. Experimental values of g-tensor, hf splitting and shf splitting are determined. The values of spin-Hamiltonian parameters and the mechanism of the centre formation and its location in the crystal are discussed. I n Kristallen einer polaren Phase von cc-LiIO, wird ein EPR,-Spektrum bei v = 34,633 GHz undT = 290 O K beobachtet. Das Spektrum hesteht aus zivei Sextetts. Jede Linie des Sextetts spaltet in ein Doublett und ein Multiplett auf. Das Spektrum wird zwei Zentren von .JOY mit einer aquivalenten Struktiir zugeordnet. Es wird gezeigt, dall ein 27-Elektronenzentrum J0:aus den JOY-Ionen unter y-Bestrahlung gebildet wird. Eine Ladungskompensation beruht auf der Oxydation von Fez+, das in den Kristallen als Storstellen vorhanden ist. Experimentelle Werte des g-Tensors und der hf-und shf-Aufspalbung werden bestimmt. Die Werte der Parameter des Spin-Hamiltonoperators und der Mechanismus der Zentrenbildung soivie deren Lokalisierung im Kristall werden diskutiert.

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