Spectra of CO2–N2 dimer in the 4.2 μm region: Symmetry breaking of the intramolecular CO2 bend, the intermolecular bend, and higher <i>K</i>-values for the fundamental
Bibliographic record
Abstract
Infrared spectra of the CO2–N2 dimer are observed in the carbon dioxide ν3 asymmetric stretch region (≈2350 cm−1) using a tunable infrared optical parametric oscillator to probe a pulsed slit jet supersonic expansion. Previous results for the b-type fundamental band are extended to higher values of Ka. An a-type combination band involving the lowest in-plane intermolecular bending mode is observed. This yields a value of 21.4 cm−1 and represents the first experimental determination of an intermolecular mode for CO2–N2. This intermolecular frequency is at odds with the value of 45.9 cm−1 obtained from a recent 4D intermolecular potential energy surface. In addition, two weak bands near 2337 cm−1 are assigned to the CO2 hot band transition (v1, v2l2, v3) = (0111) ← (0110). They yield a value of 2.307 cm−1 for the splitting of the degenerate CO2 ν2 bend into in-plane and out-of-plane components due to the presence of the nearby N2. The in-plane mode lies at a lower energy relative to the out-of-plane mode.
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How this classification was reachedexpand
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 | 0.000 | 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".