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 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 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.012 | 0.001 |
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".