Electron spin resonance studies of the formation and thermal stability of oxygen radicals on CaO and some other oxides

1978 ◽  
Vol 74 (0) ◽  
pp. 883 ◽  
Author(s):  
Dante Cordischi ◽  
Valerio Indovina ◽  
Manlio Occhiuzzi
Keyword(s):  
Thermal Stability ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Oxygen Radicals ◽  
Spin Resonance ◽  
Thermal Stability Of

scholarly journals ESR-thermochronometry of the Hida range of the Japanese Alps: Validation and future potential

2019 ◽  
Author(s):  
Georgina E. King ◽  
Sumiko Tsukamoto ◽  
Frédéric Herman ◽  
Rabiul H. Biswas ◽  
Shigeru Sueoka ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Late Stage ◽  
Late Quaternary ◽  
Spin Resonance ◽  
Charge Concentration ◽  
Future Potential ◽  
Thermal Histories ◽  
Thermal Stability Of

Abstract. The electron spin resonance (ESR) of quartz has previously been shown to have potential for determining rock cooling histories, however this technique remains underdeveloped. In this study, we explore the ESR of a suite of samples from the Hida range of the Japanese Alps. We develop measurement protocols and models to constrain the natural trapped charge concentration as well as the parameters that govern signal growth and signal thermal decay. The thermal stability of the Al and Ti-centres is similar to that of the luminescence of feldspar. Inverting the ESR data for cooling yields similar thermal histories to paired luminescence data from the same samples. However, a series of synthetic inversions show that whereas the luminescence of feldspar can only resolve minimum cooling histories of ∼160 °C/Myr over timescales of 103–5 a, quartz ESR may resolve cooling histories as low as 25–50 °C/Myr over timescales of 103–7 a. This difference arises because quartz ESR has a higher dating limit than the luminescence of feldspar. These results imply that quartz ESR will be widely applicable in the constraint of late-stage rock cooling histories, providing new insights into landscape evolution over late-Quaternary timescales.

Activity and thermal stability of antioxidants by differential scanning calorimetry and electron spin resonance spectroscopy

2007 ◽  
Vol 101 (3) ◽  
pp. 1108-1114 ◽  
Author(s):  
Francesca Giuffrida ◽  
Frédéric Destaillats ◽  
Maria Herrero Egart ◽  
Bernadette Hug ◽  
Pierre-Alain Golay ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Electron Spin Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry ◽  
Spin Resonance ◽  
Thermal Stability Of

scholarly journals Electron spin resonance (ESR) thermochronometry of the Hida range of the Japanese Alps: validation and future potential

Geochronology ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Georgina E. King ◽  
Sumiko Tsukamoto ◽  
Frédéric Herman ◽  
Rabiul H. Biswas ◽  
Shigeru Sueoka ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Late Stage ◽  
Late Quaternary ◽  
Spin Resonance ◽  
Charge Concentration ◽  
Future Potential ◽  
Thermal Histories ◽  
Thermal Stability Of

Abstract. The electron spin resonance (ESR) of quartz has previously been shown to have potential for determining rock cooling histories; however, this technique remains underdeveloped. In this study, we explore the ESR of a suite of samples from the Hida range of the Japanese Alps. We develop measurement protocols and models to constrain the natural trapped-charge concentration as well as the parameters that govern signal growth and signal thermal decay. The thermal stability of the Al and Ti centres is similar to that of the luminescence of feldspar. Inverting the ESR data for cooling yields similar thermal histories to paired luminescence data from the same samples. However, a series of synthetic inversions shows that whereas the luminescence of feldspar can only resolve minimum cooling histories of ∼160 ∘C Myr−1 over timescales of 103−5 years, quartz ESR may resolve cooling histories as low as 25–50 ∘C Myr−1 over timescales of 103−7 years. This difference arises because quartz ESR has a higher dating limit than the luminescence of feldspar. These results imply that quartz ESR will be widely applicable in the constraint of late-stage rock cooling histories, providing new insights into landscape evolution over late Quaternary timescales.

Thermal stability of some radiation damage products in X-irradiated NaClO3

1979 ◽  
Vol 57 (2) ◽  
pp. 128-131 ◽  
Author(s):  
V. S. Sivasankar ◽  
P. W. Whippey
Keyword(s):  
Thermal Stability ◽  
Electron Spin Resonance ◽  
Radiation Dose ◽  
Optical Absorption ◽  
Radiation Damage ◽  
Sodium Chlorate ◽  
X Rays ◽  
Optical Absorption Spectra ◽  
Spin Resonance ◽  
Thermal Stability Of

Single crystals of sodium chlorate have been exposed to X-rays, at 77 K. Thermoluminescence glow curves of the irradiated crystals have been recorded from 77 to 400 K. Optical absorption spectra and electron spin resonance spectra of the crystals subjected to radiation damage have also been recorded as a function of radiation dose, and at different stages of thermal annealing between 77 and 400 K. Using the optical and ESR data, the glow peaks at 173, 185, and 249 K have been identified as due to O2− in the vicinity of ClO3, ClO3, itself, and O2− adjacent to ClO2, respectively. The trapping parameters for these centers have been determined.

Electron Spin Resonance Dating of the Pleistocene Coral Reef Tracts of Barbados

1988 ◽  
Vol 29 (3) ◽  
pp. 197-215 ◽  
Author(s):  
Ulrich Radtke ◽  
Rainer Grün ◽  
Henry P. Schwarcz
Keyword(s):  
Thermal Stability ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Esr Dating ◽  
Geological Society ◽  
The Past ◽  
Spin Resonance ◽  
Unpublished Thesis ◽  
Mcgill University ◽  
Dating Method

The reef tracts of Barbados have been investigated by electron spin resonance dating; all parameters necessary for ESR dating (including effective α-efficiency and thermal stability) were determined without cross checking with another independent dating method. In addition, some U-series analyses were carried out in order to test the reliability of ESR. In most cases, the results show a satisfactory agreement between ESR and both these and previously published U-series dates (M. L. Bender, R. G. Fairbanks, F. W. Taylor, R. K. Matthews, J. G. Goddard, and W. S. Broecker (1979). Geological Society of America. Bulletin 90 , 577–594). For the oldest samples, ESR dates tend to exceed He/U dates, suggesting that there might have been He loss from aragonite. Raised reef tracts are assigned to high sea stands from successive interglacial stages 5, 7, 9, 11, 13, and 15. ESR and U-series (230Th/234U) dates for corals and molluses in North Barbados do not support the suggestion of N. P. James ((1971). Unpublished Thesis, McGill University, Montreal) that this region has subsided during part of the past 125,000 yr. Whereas the experimentally determined mean life (τ) of trapped electrons is only 500,000 yr for the ambient temperature in Barbados, there is no evidence from the comparison between ESR and other dates for thermal fading. This emphasizes the difficulty of experimental measurement of τ.

Electron spin resonance detection of oxygen radicals released by UVA-irradiated human fibroblasts

1999 ◽  
Vol 96 (1) ◽  
pp. 101-109
Author(s):  
J. P. Souchard ◽  
G. Pierlot ◽  
M. A. Barbacanne ◽  
M. Charveron ◽  
J.-L. Bonafé ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Oxygen Radicals ◽  
Human Fibroblasts ◽  
Spin Resonance ◽  
Resonance Detection
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