Trends in the alkaline-earth amide series: The millimetre-wave spectrum of MgNH<sub>2</sub> and MgND<sub>2</sub> (<sup>2</sup>A<sub>1</sub>)
Bibliographic record
Abstract
The pure rotational spectra of MgNH2 ([Formula: see text]2A1) and its deuterium isotopomer have been recorded using millimetre/sub-millimetre wave direct absorption techniques. Both species were synthesized by the reaction of magnesium vapor and either NH3 or ND3 in a dc discharge. Twelve rotational transitions were measured for MgNH2, and eight transitions were observed for MgND2, both in the range 120530 GHz. Asymmetry components with Ka= 05,7, and sometimes 6, were measured for nearly every transition. Rotational, centrifugal distortion, and spinrotation parameters have been accurately determined for both molecules, as well as an r0 structure for magnesium amide. The data indicate that MgNH2is a planar molecule with C2v symmetry, similar to CaNH2 and SrNH2, and does not undergo inversion. However, there appears to be subtle differences between MgNH2 and its calcium and strontium analogs. Magnesium amide, for example, has a significantly larger HNH bond angle than CaNH2and SrNH2. In addition, the spinrotation constants indicate slightly more in-plane p character for the unpaired electron in this molecule relative to that in calcium or strontium amide. Such differences may result from more covalent character in the bonding of MgNH2 in comparison to the heavier alkaline-earth amide species. PACS No.: 32.20Bx
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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".