<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Reset mechanisms of thermoluminescence (TL) signals in the near-surface layers (~500 nm thick) of quartz grains during milling are discussed on the basis of the dependence of TL glow-curves and infrared absorption spectra on grain diameter. TL measurements (heating to 370°C at 1°C/s) indicate that the near-surface layer does not seem to emit TL at ~250-400°C, especially in the blue range, even in TL measurements after re-irradiation. In contrast, the layer seems to emit more TL at ~130°C than the inner original quartz. On the other hand, diffused reflection infrared Fourier transform spectrometry indicates that hydroxyl species (e.g. Al-OH, Li-dependent OH and molecular H<sub>2</sub>O species) are deformed in the near-surface layer. These two series of data suggest that TL recombination sites in the near-surface layer are deformed or broken during milling and contribute to TL emission unusually strongly.</p></abstract>

Reset mechanisms of thermoluminescence (TL) signals in the near-surface layers (~500 nm thick) of quartz grains during milling are discussed on the basis of the dependence of TL glow-curves and infrared absorption spectra on grain diameter. TL measurements (heating to 370°C at 1°C/s) indicate that the near-surface layer does not seem to emit TL at ~250-400°C, especially in the blue range, even in TL measurements after re-irradiation. In contrast, the layer seems to emit more TL at ~130°C than the inner original quartz. On the other hand, diffused reflection infrared Fourier transform spectrometry indicates that hydroxyl species (e.g. Al-OH, Li-dependent OH and molecular H2O species) are deformed in the near-surface layer. These two series of data suggest that TL recombination sites in the near-surface layer are deformed or broken during milling and contribute to TL emission unusually strongly.

Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains

Earthquake Prediction Research Center, Institute of Oceanic Research and Development, Tokai Univeriswty, Orido 3-20-1, Shimizu-ku, Shizuoka 424-8610, Japan

Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-ninocho, Niigata 950-2181, Japan

Department of Chemistry, Faculty of Science, Niigata University, 8050 Ikarashi-ninocho, Niigata 950-2181, Japan

Geochronometria

Reset mechanisms of thermoluminescence (TL) signals in the near-surface layers (~500 nm thick) of quartz grains during milling are discussed on the basis of...

Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains

Pubblicato online: 30 gen 2009

Pagine: 61 - 68

DOI: https://doi.org/10.2478/v10003-008-0021-x

Parole chiave
thermoluminescence (TL), diffused reflection infrared fourier transform (DRIFT) spectrometry, hydroxyl species, quartz, milling

This content is open access.

Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains

Pubblicato online: 30 gen 2009

Pagine: 61 - 68

DOI: https://doi.org/10.2478/v10003-008-0021-x

Parole chiavethermoluminescence (TL), diffused reflection infrared fourier transform (DRIFT) spectrometry, hydroxyl species, quartz, milling

This content is open access.

Parole chiave
thermoluminescence (TL), diffused reflection infrared fourier transform (DRIFT) spectrometry, hydroxyl species, quartz, milling