Theoretical and Experimental Studies of the Reactions between Hyperthermal O(<sup>3</sup>P) and Graphite: Graphene-Based Direct Dynamics and Beam-Surface Scattering Approaches
Bibliographic record
Abstract
Beam-surface scattering experiments and theoretical direct dynamics based on density functional theory calculations are used to investigate hyperthermal collisions between O((3)P) and highly oriented pyrolytic graphite (HOPG). The simulations suggest that the HOPG surface becomes functionalized with epoxide groups. Intersystem crossing (ISC) between the lowest-energy triplet and singlet potential-energy surfaces is not necessary for this functionalization to occur. Both theory and experiment indicate that incoming O atoms can react at the surface to form O(2) by way of an Eley-Rideal mechanism. They also suggest that the collisions can result in the production of CO and CO(2) by way of both direct and complex reaction mechanisms. The direct dynamics simulations provide significant insight into the details of the complex reaction mechanisms. Semiquinones are present at defect sites and can form in functionalized pristine sheets, the latter resulting in the formation of a defect. Direct collision of an incoming O atom with a semiquinone or vibrational excitation caused by a nearby O-atom collision can cause the release of the semiquinone CO, forming carbon monoxide. The CO may react with an oxygen atom on the surface to become CO(2) before receding from the surface. The simulations also illustrate how epoxide groups neighboring semiquinones catalyze the release of CO. Throughout, the experimental results are observed to be consistent with the theoretical calculations.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".