A <sup>19</sup>F and <sup>1</sup>H goniometric split‐millicoil NMR probe for solid‐state NMR
Bibliographic record
Abstract
Abstract To allow for single‐crystal nuclear magnetic resonance (scNMR) investigations, an existing narrow bore high‐field double‐resonance millicoil 19F and 1H solid‐state NMR probe was modified by adding a goniometer stage to the top. The goniometer was kept outside of the radiofrequency (RF) transceiver coil for improved filling factor and probe sensitivity. Because of the large size of single crystal grown, the transceiver coil was changed from a standard millicoil to a split‐millicoil, or crude helmholtz coil, design with effects on probe performance further studied herein. The type of goniometer and crystal sample holder chosen allows for accurate rotation of the single crystal in all three orthogonal planes (x, y, and z) while allowing for the sample to be easily removed forX‐ray diffraction study. Careful consideration was taken in selection of non‐fluorinated materials making up the probe head to reduce unwanted 19F background in the NMR signal. Goniometer functionality is demonstrated by 19F scNMR rotation spectra of 5‐fluoro‐DL‐tryptophan (5F‐DL‐Trp) required to determine the independent elements of its 19F chemical shielding anisotropic tensor. © 2007 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 31B: 203–208, 2007
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.014 | 0.003 |
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".