Enhanced ionization of the two-electron molecule H2 in intense laser fields : Mechanism of the creation of doorway states
Bibliographic record
Abstract
We investigate the mechanism of enhanced ionization in the two electron molecule H 2 subjected to an ultrashort, intense laser pulse by solving exactly the time-dependent Schrodinger equation for a one-dimensional model. Results of the simulation are analyzed by using the field following three adiabatic states that are adiabatically connected with the lowest three essential electronic states of H 2 as a field changes. Ionization is enhanced when the excited ionic state H - H + is most efficiently created from the covalent ground state HH in the level dynamics prior to ionization. An analytic expression for the ionic and covalent crossing condition is also obtained in terms of the three essential states and agrees well with the numerical results. As the internuclear distance R decreases, the population of the H - H + created increases whereas the ionization rate from a pure H - H + state decreases owing to the stronger attraction by the distant nucleus. As a result, the ionization is most enhanced at intermediate internuclear R (6) range where covalent and ionic configurations cross.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".