PROBING THE ZEEMAN EFFECT IN LOW-Ω F4∆← X 4∆ TRANSITIONS IN FeH
Bibliographic record
Abstract
This work targets laboratory studies of the Zeeman effects in selected transitions of the FeH radical, observed in the atmospheres of dwarf stars. \nThe \\emph{F}$\\leftarrow $\\emph{X} electronic system falls around 1 $\\mu$m, and matches observation windows of the high-resolution spectropolarimeters \nSPIRou (brought into service in 2019) and ESPaDOnS mounted at the Canada-France-Hawaii Telescope. Many field-free line positions have already been reported for this radical from laboratory studies, notably from high-temperature sources\\footnote{Line intensities and molecular opacities of the FeH $\\emph{F}^4\\Delta_{i}\\leftarrow \\emph{X}~^4\\Delta_i$ transition; Dulick $et~al$; Astrophys. J., \\underline{594}, 651-63, (2003)}\\footnote{The near-Infrared Spectrum of the FeH Molecule; Phillips $et~al$; Astrophys. J. Supp. Ser., 65, 721-78, (1987)}.\n\n Our earlier work with a sputter source\\footnote{Determination of Land\\'e factors in the $F~^4\\Delta_{\\frac{5}{2},\\frac{7}{2}}$ state of FeH by laser excitation spectroscopy; Crozet $et~al.$; J. Mol. Spectrosc., \\underline{303}, 46-53, (2014)} yielded information on magnetic response for just a few transitions between the two lowest spin components of the $F$ and $X$ states. \nWe report here some preliminary results obtained from FeH formed in reaction between hydrogen atoms (generated in a microwave discharge of H$_2$ in argon) and traces of iron pentacarbonyl vapour, at pressures around 1 Torr. This source\\footnote{Detection of the free radicals FeH, CoH and NiH by far IR laser magnetic resonance; Beaton $et~al.$; J. Chem. Phys. \\underline{89}, 4446-48, (1988)} seems to produce more population in the $\\emph{X}~^4\\Delta_{3/2}$ and $\\emph{X}~^4\\Delta_{1/2}$ components of the ground state. Laser excitation of [1-0] transitions, with lock-in detection of fluorescence in the [1-1] band to eliminate laser scatter, has allowed some Zeeman-broadened profiles to be measured.
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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) | 0.003 | 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".