Laser-Induced Phosphorescence of SO<sub>2</sub> in Solid Neon: Direct Observation of the <i>b</i><sup>3</sup><i>A</i><sub>2</sub> State in the <sup>16</sup>OS<sup>18</sup>O Molecule
Bibliographic record
Abstract
Laser excitation of isotopically labeled SO 2 molecules in a neon matrix has allowed the measurement of dispersed phosphorescence spectra ( ã 3 B 1 - X̃ 1 A 1 ) in the wavelength region 387.5−526.3 nm (19 000−25 800 cm -1 ). The origin of the ã − X̃ transition lies at 25 747 cm -1 in 16 OS 16 O, shifted 18 cm -1 to the red from the gas phase; the three vibrational frequencies of the X̃ state are nearly unperturbed in the neon matrix (1149, 520, and 1362 cm -1 ). As the zero-phonon lines are sharp and well resolved, it has been possible to monitor emission from a specific isotopomer to obtain its excitation spectrum. The excitation spectra of matrix-isolated 16 OS 16 O and 18 OS 18 O in the region 350.9−388.5 nm (25 740−28 500 cm -1 ) are similar to those previously observed in the gas phase, with strong perturbations affecting all vibrational levels above ã 3 B 1 (110) at 27 005 cm -1 (370 nm). Two additional groups of bands are observed for the unsymmetrical isotopomer 18 OS 16 O; they are identified as transitions to levels of the ã 3 B 1 state with v 3 = 1 and as direct transitions to the b̃ 3 A 2 state, which both become allowed in the lower symmetry. The ν 3 frequency of the ã 3 B 1 state of 18 OS 16 O is 922 cm -1; for the b̃ 3 A 2 state, ν 1 ≃ 791 cm -1 and ν 2 ≃ 315 cm -1, while the b̃ (001) level lies 26 653 cm -1 above the X̃ (000) level.
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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) | 0.001 | 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".