Optical excitation spectra of trapped electrons in irradiated feldspars
Bibliographic record
Abstract
The dependence of optically stimulated luminescence spectra on the energy of excitation photons has been investigated for a wide range of feldspars. In the vicinity of the 1.44 eV resonance, the spectra are in many cases best described by a Voigt profile with a minor Lorentzian component centred at 1.44 eV. Most samples display a second excitation resonance near 1.57 eV, and more rarely a third peak at 1.3 eV. The shape of the excitation spectrum is the same for both the violet (3.1 eV) and yellow–green (2.2 eV) emission bands and, for one sample, the UV band (3.3–3.7 eV). The shape of the excitation spectrum is unaffected by the polarization direction of the excitation beam. The principal resonance at 1.44 eV broadens little, if at all, with increasing temperature over the range 290–490 K. The initial luminescence decay rate as a function of the initial luminescence intensity per unit energy was determined over a wide range of excitation energies (1.24–2.58 eV) for four feldspars. In every case, the initial slope was observed to increase linearly with the square of the initial intensity over the range 1.24–2.4 eV. All this provides strong evidence that excitation is from a single trap located at least 2.5 eV below the conduction band.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".