β-Pinene Oxidation Mechanism Investigation using Online Mass Spectrometric Measurements
Bibliographic record
Abstract
The majority of hydrocarbon oxidation mechanisms have been proposed based on experimental knowledge of relatively small species (<C4). Accurate development of these mechanisms and the resulting product distributions is critical in understanding the oxidative state of the atmosphere. Gas phase oxidation processes result in the formation of multiple generations of oxygenated compounds that in many cases contribute to the formation and or growth of secondary organic aerosols. The ability to use mass spectrometry to monitor the gas phase evolution of hydrocarbon oxidation and subsequent product processing has been investigated. Oxidation experiments of -pinene by hydroxyl radicals have been carried out in the York University Smog Chamber with successful identification of products and their NOx sensitivities using an atmospheric pressure chemical ionization triple quadrupole mass spectrometer. The chemical composition of these products is varied including hydoxyl, carbonyl and nitrate functional groups in a variety of combinations. Real time acquisition and analysis of the oxidation products under varied NOx conditions has provided experimental insight into formation pathways. This method shows great promise for providing direct experimental evidence for oxidation mechanism elucidation. Mechanistic implications for several -pinene oxidation products based on acquired reaction time profiles in differentNOx environments are presented.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".