Recombination studies of Xe<sub>2</sub><sup>+</sup> following associative ionization of laser-excited Xe
Bibliographic record
Abstract
Experiments are described where two-photon transitions in atomic xenon have been laser-excited from the 1 S 0 ground state to Xe* np ( n = 8−11) and Xe* n f ( n = 4−8) Rydberg states in an apparatus which combines a time-of-flight mass spectrometer and a dispersive photoelectron spectrometer. Xe* atoms in n f-states, but not in n p-states, undergo rapid associative ionization to form Xe 2 + , followed by dissociative recombination to form atoms predominantly in lower energy 6p and 5d excited states. Orbital selectivity for associative ionization can be explained by a simple qualitative model where the Rydberg n f-electron is radially localized outside the Xe + core for long periods of time due to a larger centrifugal barrier in the effective atomic potential. This enhances the probability that excited Xe atoms in an n f state will encounter a ground state atom at those impact distances that lead to the formation of dimer ions.
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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 | 0.001 |
| 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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".