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 1S0 ground state to Xe* np (n = 8−11) and Xe* nf (n = 4−8) Rydberg states in an apparatus which combines a time-of-flight mass spectrometer and a dispersive photoelectron spectrometer. Xe* atoms in nf-states, but not in np-states, undergo rapid associative ionization to form Xe2+, 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 nf-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 nf 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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".