The Infrared Spectrum of 13C2H2 : Bending States up to v4 + v5 = 4
Bibliographic record
Abstract
The vibration rotation spectra of 13C substituted acetylene, 13C2H2, have been recorded in the region between 60 and 2700 cm1 with an effective resolution ranging from 0.001 to 0.006 cm1. In the FIR range, from 60 to 250 cm1, the Canadian Light Source synchrotron facility was used (resolution = 0.001 cm1). Between 400 and 800 cm1 the modified BOMEM FTIR instrument present in Ottawa was used (resolution = 0.002 – 0.003 cm1) . The spectra above 1000 cm--1 were recorded in Bologna at a resolution of 0.004 – 0.006 cm1. A total of about 9500 rovibrational transitions have been assigned to 101 bands involving the bending states up to vt = v4 + v5 = 4, allowing the characterization of the ground state and of 33 vibrationally excited states. All the bands involving states up to vt = 3 have been analyzed simultaneously by adopting a model Hamiltonian which takes into account the vibration and rotation l-type resonances. The derived spectroscopic parameters reproduce the transition wavenumbers with a RMS value of the order of the experimental uncertainty. Using the same model larger discrepancies between observed and calculated values have been obtained for transitions involving states with vt = 4. These could be satisfactorily reproduced only adopting, in addition to the previously determined parameters which were constrained in the analysis, a set of effective constants for each vibrational manifold.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.001 |
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".