THE 4.2 MICRON SPECTRA OF CO<sub>2</sub>-CO DIMER FOR BOTH THE C- AND O-BONDED ISOMERS, INCLUDING SPLITTING OF THE DEGENERATE &#957;<sub>2</sub> BEND IN THE PRESENCE OF CO
Bibliographic record
Abstract
CO$_2$-CO dimer was previously observed by high-resolution microwave and infrared spectroscopy in the form of a planar T-shaped C-bonded structure.\\footnote{A.C. Legon, A.P. Suckley, \\textit{Journal of Chemical Physics} \\textbf{91} 4440 (1989).}$^,$\\footnote{R.W. Randall, J.P.L. Summersgill, B.J. Howard, \\textit{Journal Chemical Society Faraday Transactions} \\textit{86} 1943 (1990).} More recently, spectra of a second isomer were observed in the stretching region of carbon monoxide.\\footnote{S. Sheybani-Deloui, A.J. Barclay, K.H. Michaelian, A.R.W. McKellar, N. Moazzen-Ahmadi, \\textit{Journal of Chemical Physics} \\textbf{143} 121101 (2015).} This isomer has also a planar T-shaped structure, but with the CO flipped by $180^{\\circ}$. Moreover, two intermolecular frequencies were measured for each isomer. These are in very good agreement with recent high level theoretical calculations.\\\\ \nHere, CO$_2$-CO dimer is observed in the carbon dioxide $\\nu_3$ asymmetric stretch region ($\\sim$2350 cm$^{-1}$). Both C-bonded and O-bonded isomers are analyzed for the normal isotopologue as well as for $^{13}$CO$_2$-CO and $^{16}$O$^{13}$C$^{18}$O-CO, the latter being the first observation of an asymmetrically substituted form for which all values of K$_a$ are allowed. Combination bands involving the lowest in-plane intermolecular mode are also observed yielding frequencies of 24.51 \\wn for the C-bonded form and 14.37 \\wn for the O-bonded form. \nIn addition, two weak bands near 2337 \\wn are assigned to CO$_2$ hot band transitions (01$^{1}$1) - (01$^{1}$0), yielding the splitting of the degenerate CO$_2$ bend into in-plane and out-of-plane components due to the presence of the CO. This splitting has rather different values for the C- and O- bonded isomers, 4.56 and 1.59 \\wn, respectively, with the out-of-plane mode higher in energy than the in-plane for both cases.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.001 |
| 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".