Photoinduced EPR study of Sb2+ions in photorefractive Sn2P2S6crystals

2012 ◽  
Vol 86 (13) ◽  
Author(s):  
A. T. Brant ◽  
L. E. Halliburton ◽  
S. A. Basun ◽  
A. A. Grabar ◽  
S. G. Odoulov ◽  
...  
Keyword(s):  
Photoinduced Epr

scholarly journals Electron Transfer Quenching and Photoinduced EPR of Hypericin and the Ciliate Photoreceptor Stentorin

1997 ◽  
Vol 101 (40) ◽  
pp. 7460-7460 ◽  
Author(s):  
Todd A. Wells ◽  
Aba Losi ◽  
Renke Dai ◽  
Paul Scott ◽  
Michael Anderson ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Epr

SPECIFIC CHARACTERISTICS OF ELECTRON PARAMAGNETIC RESONANCE SPECTRUM OF DIFFERENT COLORS OF HAIR

2019 ◽  
Vol 49 ◽  
pp. 144-145
Author(s):  
Tskhvediani N. ცხვედიანი ნ. ◽  
Tsibadze A. ციბაძე ა. ◽  
Chikvaidze E. ჩიკვაიძე ე. ◽  
Kvachadze I. კვაჭაძე ი. ◽  
Khutsishvili L. ხუციშვილი ლ.
Keyword(s):  
Room Temperature ◽  
Objective Assessment ◽  
Human Organism ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Brown Hair ◽  
Study Results ◽  
Epr Signal ◽  
Electron Paramagnetic ◽  
Photoinduced Epr

 In the result of  interaction of  the metabolic processes of the human organism and external factors free radicals are formed  in tissues including hair. An objective assessment of an intensity of this process is possible by means of electronic  paramagnetic resonance’s (EPR) signal and its intensity indices. The purpose of the survey was a comparative evaluation of the EPR spectrum’s specificity of black and brown hair and a study of a photo dynamic in the condition of a treating with blue light. The survey was conducted among young volunteers  of age 17-21  on the base of their informed consent and with adherence of all bioethical requirements established for this type of research. No single person’s hair  involved  in the survey  was treated with chemical dye or active, specific remedy for hair care. This article analyzes data of  young men donors. All measurements were carried out at standard conditions: room temperature (22-240C), humidity - 60-70%, the measurement error - ± 5%. EPR spectrum was determined at the Department of Biophysics,TSU by means of a radio-spectrometer TSR - V. Study  results have determined a uniform EPR spectrum and no difference in the intensity of the photoinduced EPR spectrum that indicates  the equal concentrations of eumelanin in black and brown hair.

Photoinduced Changes in the Charge States of Native Donors and Acceptors in ZnGeP2

1999 ◽  
Vol 607 ◽  
Author(s):  
K. T. Stevens ◽  
S. D. Setzler ◽  
P. G. Schunemann ◽  
T. M. Pollak ◽  
N. C. Giles ◽  
...  
Keyword(s):  
Wavelength Dependence ◽  
Photoinduced Change ◽  
Native Defects ◽  
Near Ir ◽  
Laser Systems ◽  
Epr Signal ◽  
Photoinduced Changes ◽  
Center Time ◽  
Photoinduced Epr ◽  
Zn Vacancy

AbstractBulk ZnGeP2 (ZGP) crystals grown for high-power tunable mid-infrared laser systems contain large concentrations of three native defects. Using EPR, these three defects have been identified as the Zn vacancy (an acceptor), the phosphorus vacancy (a donor), and the germanium-on-zinc antisite (also a donor). We have studied the wavelength dependence of the photoinduced changes in the EPR signal intensity of the three defect centers using 633 nm and 1064 nm light. We observe a significant increase in the EPR signal under 633 nm light. The 633-nm light also produces an increase in the defect-related 1-R.m absorption band, and we have used a spectrophotometer to measure the spectral shape of the photoinduced change in absorption in this near-IR region. The 633-nm wavelength produces paramagnetic forms of both donor centers, while 1064 nm light only produces the EPR-active center. Time decays of the photoinduced EPR signals have been measured for each of the donors.

scholarly journals Mineral-polymer composites based on hydroxyapatite with polyvynylpyrrolidon for medicine

2019 ◽  
Vol 487 (3) ◽  
pp. 270-274
Author(s):  
I. V. Fadeeva ◽  
F. I. Grabovenko ◽  
A. S. Fomin ◽  
S. M. Barinov ◽  
F. F. Murzakhanov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Epr Spectroscopy ◽  
Coherent Scattering ◽  
Coherent Scattering Region ◽  
Paramagnetic Resonance ◽  
Transmission Electron ◽  
Electron Paramagnetic ◽  
Photoinduced Epr

Composites of hydroxyapatite (HA) with polyvinylpyrrolidone (PVP) were synthesized by precipitation in water solutions, mass relations of HA/PVP varied in region 3,6-14,5. The composite materials were investigated using XRD, IR, electron paramagnetic resonance (EPR) spectroscopy and transmission electron microscopy (TEM). Based on the TEM results it was found that during calcination of composites at 400 °C small agglomerates consisting of individual crystalline HA particles were formed, resulting in a particle size (according to TEM) slightly larger than coherent scattering region. Using the method of photoinduced EPR spectroscopy confirmed the presence of interaction between HA and PVP. The resulting composites can be used as materials for reconstructive surgery.

On the origin of the hyperfine structure in the photoinduced EPR spectrum of [Pt(en)2]Pt(en)2Cl2](ClO4)4

1992 ◽  
Vol 84 (10) ◽  
pp. 979-984 ◽  
Author(s):  
C.A. Arrington ◽  
C.J. Unkefer ◽  
R.J. Donohoe ◽  
S.C. Huckett ◽  
S. Kurita ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Epr Spectrum ◽  
Photoinduced Epr

Electron Transfer Quenching and Photoinduced EPR of Hypericin and the Ciliate Photoreceptor Stentorin†

1997 ◽  
Vol 101 (4) ◽  
pp. 366-372 ◽  
Author(s):  
Todd A. Wells ◽  
Aba Losi ◽  
Renke Dai ◽  
Paul Scott ◽  
Su-Moon Park ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Epr

Properties of photoinduced EPR signals from real silicon and germanium surfaces

1974 ◽  
Vol 21 (2) ◽  
pp. K127-K129 ◽  
Author(s):  
V. V. Kurylev ◽  
S. N. Karyagin
Keyword(s):  
Silicon And Germanium ◽  
Photoinduced Epr
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