New infrared absorption cross sections of pentafluoroethane (HFC-125) for atmospheric remote sensing
Bibliographic record
Abstract
Pentafluoroethane (CF 3 CHF 2 ; HFC-125) is a hydrofluorocarbon (HFC) widely used as a firefighting agent, and in refrigeration systems and heat pumps, particularly as a 50/50 blend with difluoromethane (CH 2 F 2 ; HFC-32) known as R-410A. HFCs are currently being phased out under the terms of the Montreal Protocol (Kigali Amendment). In order to monitor the concentration profiles of HFC-125 in the atmosphere using infrared-sounding instruments, such as the Atmospheric Chemistry Experiment – Fourier transform spectrometer (ACE-FTS), accurate laboratory spectroscopic data are required. This work describes 29 new high-resolution infrared absorption cross sections of pentafluoroethane / dry synthetic air over the spectral range 700 – 1375 cm -1 , derived from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26-cm-pathlength cell. Spectra were recorded at resolutions between 0.01 and 0.03 cm -1 (calculated as 0.9/MOPD; MOPD = maximum optical path difference) over a range of temperatures and pressures (189 – 296 K and 7.5 – 760 Torr). The new absorption cross sections in this work improve upon those available in HITRAN 2020 for remote sensing.
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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) | 0.001 | 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) | 0.000 | 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".