Raman spectra of molecular crystals at high pressures: VIII—Boron tribromide
Bibliographic record
Abstract
Abstract Raman spectra of liquid and solid boron tribromide, BBr3, at ambient temperature and at pressures up to 10 GPa are reported. The freezing pressure was determined as 0.38 ± 0.05 GPa. Three fundamental peaks, assigned as librational, bending and stretching modes, were tracked as a function of pressure, and their wavenumbers were fitted to quadratic functions and approached asymptotic values at the highest pressures. The spectra evolved smoothly and there was no evidence of discontinuities associated with structural phase transitions or of major molecular distortions in this pressure range. All modes showed increases in wavenumber with pressure, and that of the lattice mode was appreciable, corresponding to a more than four‐fold increase in intermolecular bonding strength at 10 GPa. At high pressures, there was a minor but irreversible colour change of the sample, probably indicative of molecular dissociation and the release of bromine. The results were compared with corresponding data on BI3 and with those obtained from samples at low temperatures. Copyright © 2003 John Wiley & Sons, Ltd.
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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".