Above-Threshold Effects in the Photodissociation and Photoionization of Iodobenzene
Bibliographic record
Abstract
The method of velocity map imaging is used to investigate the photoinduced dynamics of iodobenzene in weak laser fields as well as in fields of sufficient intensity to produce multiphoton excitation without dressing the potential energy surfaces. The speed and angular distributions of the recoiling iodine atoms observed with weak fields at 266 and 304 nm are in good agreement with previous studies, showing evidence of dissociation via n,σ* and π,π* states. Density functional theory calculations are used to determine the energies of the excited states. Ion and electron images produced with intense visible radiation (532−609 nm, 3 × 10 10 to 5 × 10 12 W/cm 2 ) show both two-photon threshold dissociation and higher order (four- to seven-photon) ionization processes. A unique characteristic of the I + images obtained with intense visible radiation is a continuous, hourglass-shaped feature peaked at zero kinetic energy, displaying highly nonstatistical speed and angular distributions. A mechanism that is consistent with all of the observations is dissociative autoionization of a superexcited repulsive Rydberg state.
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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) | 0.000 | 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) | 0.000 | 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".