Kinetics of the Gas-Phase O(<sup>1</sup>D) + CO<sub>2</sub> and C(<sup>1</sup>D) + CO<sub>2</sub> Reactions over the 50–296 K Range
Bibliographic record
Abstract
The kinetics of the reactions of CO 2 with atomic oxygen and atomic carbon in their first excited singlet states have been studied at room temperature and below using the Laval nozzle reactor method. O( 1 D) and C( 1 D) atoms were created in situ by the 266 nm pulsed laser photolysis of O 3 and CBr 4 precursor molecules, respectively. While O( 1 D) atoms were detected directly by vacuum ultraviolet laser-induced fluorescence at 115 nm, C( 1 D) atoms were followed indirectly through a chemical tracer method. The measured rate constants for the O( 1 D) + CO 2 reaction are found to be in excellent agreement with earlier work and extend the available kinetic data for this process down to 50 K. The present work represents the first kinetics study of the C( 1 D) + CO 2 reaction below room temperature. Both reactions display rate constants that increase as the temperature falls, with a more substantial rate increase observed for the O( 1 D) + CO 2 reaction. This finding could be due to the increasing lifetimes of the intermediate species involved at lower temperatures.
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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 | 0.001 |
| 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) | 0.002 | 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".