Spectral features of photoionization of ground and excited levels of P I
Bibliographic record
Abstract
Spectral features of photoionization of various fine structure levels of P I, (P I + hν → P II + e), are reported. These include characteristic features of Rydberg and Seaton resonances, equivalent electron levels, low and high lying excited levels, and their impact on the background cross sections, and effects of fine structure couplings. Calculations were carried out in the relativistic Breit–Pauli R-matrix method with close-coupling (CC) approximation that generates the resonances naturally. The CC wavefunction expansion for P I includes ground and 27 excited levels of the core ion P II with orbitals of n = 3 and n = 4 complexes and 87 configurations of P I for bound channel contributions. Photoionization cross sections (σ PI ) with detailed resonances are presented for all 543 fine structure levels of P I found with 1/2 ≤ J ≤ 15/2 of even and odd parities and n ≤ 10 and l ≤ 9. The autoionizing resonances are delineated with a fine energy mesh to observe the fine structure effects. The ground level shows typical feature of smoothly decreasing σ PI with increasing energy. However, a compressed set of narrow resonances is found to form by the coupling of channels in fine structure at the ionization threshold of photoionization for the ground and many excited levels. These resonances and strong Rydberg resonances in the low energy region are found in photoionization spectra of the five equivalent electron levels of P I. Low lying excited levels show presence of strong Rydberg resonances and many with enhanced background cross section. Prominent Seaton resonances due to photo-excitation-of-core, often with enhanced background, are seen in photoionization of single valence electron high lying excited levels. Partial cross sections of the ground level with various core ion states are also presented. The present results should provide high-accuracy parameters of various model applications, such as, for exoplanetary atmosphere spectroscopy.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".