Second Harmonic Generation at Chemically Modified Si(111) Surfaces
Bibliographic record
Abstract
Si(111) surfaces with covalently attached monolayers have been investigated by optical second harmonic generation (SHG). The surfaces are modified by wet chemical procedures and studied by SHG in air or in a liquid immersion cell, using fundamental wavelengths λ = 775 and 830 nm. Results are reported for monolayers including −H, −C 10 H 21 (decyl), −O−C 10 H 21 (decyloxy) and −Cl, and for a Si(111) surface with a native oxide film. The rotational anisotropy of the SHG efficiency has been studied and estimates have been made of the relative values of nonlinear susceptibilities for the surface and bulk response. The mechanisms that contribute to SHG are identified. The application of SHG for in situ monitoring of chemical reactions of Si(111)−H is demonstrated, and results are presented for the formation of Si(111)−Cl in a UV photoinduced reaction in liquid CCl 4 .
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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) | 0.001 | 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".