SPECTROSCOPY OF THE X1Σ+, A1Π and B1Σ+ ELECTRONIC STATES OF MgS
Bibliographic record
Abstract
The spectra of some astrophysical sources contain signatures from molecules containing magnesium or sulphur atoms. Therefore, we have extended previous studies of the diatomic molecule \\chem{MgS}, which is a possible candidate for astrophysical detection. Microwave spectra of X$^1\\Sigma^+$ , the ground electronic state, were reported in 1989\\footnote{S. Takano, S. Yamamoto and S. Saito, Chem. Phys. Lett. \\textbf{159}, 563-566 (1989).} and 1997\\footnote{K. A. Walker and M. C. L. Gerry, J. Mol. Spectrosc \\textbf{182}, 178-183 (1997).}, and the B$^1\\Sigma^+$--X$^1\\Sigma^+$ electronic absorption spectrum in the blue was last studied in 1970\\footnote{M. Marcano and R. F. Barrow, Trans. Faraday Soc. \\textbf{66}, 2936-2938 (1970).}. We have investigated the B$^1\\Sigma^+$--X$^1\\Sigma^+$ 0-0 spectrum of \\chem{MgS} at high resolution under jet-cooled conditions in a laser-ablation molecular source, and have obtained laser-induced fluorescence spectra from four isotopologues. Dispersed fluorescence from this source identified the low-lying A$^1\\Pi$ state near 4520 \\wn. We also created \\chem{MgS} in a Broida oven, with the help of a stream of activated nitrogen, and took rotationally resolved dispersed fluorescence spectra of the B$^1\\Sigma^+$--A$^1\\Pi$ transition with a grating spectrometer by laser excitation of individual rotational levels of the B$^1\\Sigma^+$ state via the B$^1\\Sigma^+$--X$^1\\Sigma^+$ transition. These spectra provide a first observation and analysis of the A$^1\\Pi$ state.
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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) | 0.002 | 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".