The SiP molecule: The first observation and spectroscopic characterization
Bibliographic record
Abstract
SiP molecules have been produced in a molecular free jet apparatus by laser vaporizing a silicon rod in the presence of He doped with phosphine (PH3) gas. Excitation spectra have been observed in the 21200–22350 cm–1 range by monitoring laser induced fluorescence. Dispersed fluorescence spectra have been recorded out of the upper states of the excitation bands. The ground electronic state is X 2Πi with the spin–orbit splitting A=−186.774(11) cm−1, the harmonic wavenumber ωe=615.7(6) cm−1, and the equilibrium internuclear distance re=2.0775(17) Å. Two excited electronic states, A 2Σ+ and B 2Σ+, are observed at T0=427.4(5) and 21317.1(1) cm−1, respectively. The harmonic wavenumbers, ωe, and the equilibrium internuclear distances, re, are 680(2) cm−1 and 1.9658(13) Å, respectively, for the A 2Σ+ state and 455(1) cm−1 and 2.1278(8) Å, respectively, for the B 2Σ+ state. For the X 2Πi, A 2Σ+, and B 2Σ+ electronic states, RKR potentials have been generated. Franck–Condon factors for the B–X, B–A, and A–X systems have been calculated. A 2Σ+, v∼X 2Π1/2, v+1 perturbations have been observed. A deperturbation procedure has yielded the off-diagonal spin–orbit electronic matrix element equal to 51(8) cm−1. This work represents the first spectroscopic investigation of the SiP molecule.
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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 | 0.001 |
| 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".