Herzberg Type-I or Type-II Predissociation Dynamics at the Conical Intersection: Bifurcation into Adiabatic or Nonadiabatic Pathway
Bibliographic record
Abstract
Bifurcation dynamics into Herzberg type-I and type-II predissociation pathways at the conical intersection have been characterized in terms of their distinct reaction rates and energy-disposal dynamics from the picosecond time-resolved product state distributions measured at multiple S 1 /S 2 vibronic states of thioanisole (C 6 H 5 SCH 3 ). Electronic predissociation (type-I) occurs on a faster time scale and leads to the larger translational energies being released to the fragments (C 6 H 5 S • + • CH 3 ) compared to the vibrational predissociation (type-II). While type-II dominates at the S 1 zero-point level, the type-I quantum yield increases sharply near the S 1 /S 2 conical intersection, which is consistent with the striking dynamic resonance observed for the reactive flux in the proximity of the conical intersection. Nonadiabatic product yield at the asymptotic limit was found to be enhanced predominantly through the type-I channel, suggesting that the quantum-mechanical nature of the reactive flux prepared near the first S 1 /S 2 conical intersection is likely to be retained at the second S 0 /S 2 conical intersection encountered in the later stage as there is little time to be altered during the ultrafast S-CH 3 bond extension on the repulsive potential energy curve linking two conical intersections, enabling nonadiabatic control over product yields through the state-selection of the reactive flux.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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".