Studies of silver photodiffusion dynamics in Ag/Ge<sub><i>x</i></sub>S<sub>1−<i>x</i></sub> (<i>x</i> = 0.2 and 0.4) films using neutron reflectometry
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Bibliographic record
Abstract
To better understand the dynamics of silver photodiffusion into amorphous chalcogenide (Ch) films, it is informative to probe the time-dependent distribution of silver in the films while they are simultaneously exposed to visible light. Time-resolved neutron reflectometry is particularly well-suited to this purpose because it can follow time-dependent changes in the multilayer structure (Ag/Ag–Ch/Ch) while excluding the possibility of probe beam induced changes. This paper reports the results of time-resolved neutron reflectivity measurements of two Ag/Ge x S 1−x (x = 0.2 and 0.4) films as they are exposed to a visible light source. Analysis showed that silver diffusion occurs via two distinct processes: a fast diffusion that takes place during the first 2 and 10 min of sample illumination for the x = 0.2 and 0.4 films, respectively; and a subsequent slower change that is observed over the next 18 min (x = 0.2 film) and 107 min (x = 0.4 film). These results suggest the formation of a relatively stable Ag-rich phase in the reaction layer followed by slower diffusion at the interface between Ag-rich and Ag-poor layers. Fourier transform analysis shows that the position of the interface is essentially fixed — a conclusion that contradicts the “diffusion front” model that has been previously postulated.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.000 | 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 it