The Zeeman effect and hyperfine interactions in <i>J</i> = 1–0 transitions of CH+ and its isotopologues
Bibliographic record
Abstract
The J = 1 − 0 transitions of \documentclass[12pt]{minimal}\begin{document}$^{12}$\end{document}12CH \documentclass[12pt]{minimal}\begin{document}$^+$\end{document}+, \documentclass[12pt]{minimal}\begin{document}$^{13}$\end{document}13CH \documentclass[12pt]{minimal}\begin{document}$^+$\end{document}+, and \documentclass[12pt]{minimal}\begin{document}$^{12}$\end{document}12CD \documentclass[12pt]{minimal}\begin{document}$^+$\end{document}+ in the ground \documentclass[12pt]{minimal}\begin{document}$X^1\Sigma ^+$\end{document}X1Σ+ state have been unambiguously identified by using an extended negative glow discharge as an ion source. Unexpectedly large Zeeman splittings have been observed, and the \documentclass[12pt]{minimal}\begin{document}$^{13}$\end{document}13CH \documentclass[12pt]{minimal}\begin{document}$^+$\end{document}+ line exhibits nuclear spin-rotation hyperfine splitting in addition to the Zeeman effect. The nuclear spin-rotation coupling constant was determined to be 1.087(50) MHz for the \documentclass[12pt]{minimal}\begin{document}$^{13}$\end{document}13C species. The rotational g-factor is found to be –7.65(29), in terms of the nuclear magneton for the J = 1 and v = 0 state, more than an order of magnitude larger than values for typical diamagnetic closed shell molecules. These larger than usual magnetic interactions for a \documentclass[12pt]{minimal}\begin{document}$^1\Sigma$\end{document}1Σ molecule are caused by the large rotational energy and relatively small excitation energy of the excited \documentclass[12pt]{minimal}\begin{document}$A^1\Pi$\end{document}A1Π state. The effective g-factor and the spin-rotation coupling constant obtained by ab initio calculations agree very well with the experimentally determined values.
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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 | 0.000 |
| 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".