Infrared optical actinometry to determine N- and H-atom density in a N<sub>2</sub>–H<sub>2</sub> microwave discharge
Bibliographic record
Abstract
Abstract Infrared (IR) emission spectroscopy was performed on N2 + H2 microwave discharges at pressures ranging between 300 and 3000 mTorr. The relative atomic density of N and H was measured by optical actinometry in the IR region at various total gas pressures. The effect of relative hydrogen partial pressure (between 10 and 90% in the discharge) on N and H relative density was also investigated. Although rarely studied, optical actinometry in the IR region has nevertheless provided numerous advantages over traditional techniques performed in the UV–visible (UV–VIS) spectral region. Results show that despite the decrease in the radiative state of the N and H atoms as a function of pressure, their ground state density increased. With increased relative hydrogen concentration under constant pressure, both the ground and the radiative state density of the H atoms increased similarly to that recorded by actinometry, whereas those of the N atoms decreased as expected. In comparing the results of the H-atom density measured in the well-documented UV–visible region and the IR region, optical actinometry confirms the accuracy of the IR method.
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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 | 0.000 |
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".