Enhancement of laser-induced molecular alignment by simultaneous photodissociation
Bibliographic record
Abstract
From a three-dimensional time-dependent Schr\"odinger equation simulation for alignment of ${\mathrm{Cl}}_{2}$ by short laser pulses, we show that alignment of the ground state $(X{}^{1}{\ensuremath{\Sigma}}_{g}^{+})$ can be increased by photodissociation via a repulsive dissociative state ${(}^{1}{\ensuremath{\Pi}}_{u}).$ Initially, an intense nonresonant laser pulse ($2\ifmmode\times\else\texttimes\fi{}{10}^{13}{\mathrm{W}/\mathrm{c}\mathrm{m}}^{2},$ 1064 nm) with linear polarization aligns the molecule in the direction of the polarization as measured by $〈{\mathrm{cos}}^{2}\ensuremath{\theta}〉,$ which depends on the $J,$ ${M}_{J}$ initial conditions. Then, a second pulse with the same polarization is added in order to make perpendicular resonant transitions to the repulsive state $(1\ifmmode\times\else\texttimes\fi{}{10}^{13}{\mathrm{W}/\mathrm{c}\mathrm{m}}^{2},$ 375 nm). We show as an example for $J=4$ that the second pulse increases the alignment for each initial ${M}_{J}$ condition as measured by $〈{\mathrm{cos}}^{2}\ensuremath{\theta}{〉}_{{J=4,M}_{J}}$ and the average alignment $〈〈{\mathrm{cos}}^{2}\ensuremath{\theta}〉{〉}_{J=4}$ by reducing the proportion of the ${M}_{J}\ensuremath{\ne}0$ states. This improvement in the alignment of the molecule increases the amplitudes of the average rotational recurrences after the laser pulse and reduces the randomness in these recurrences by removing nonaligned ${M}_{J}\ensuremath{\ne}0$ states.
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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) | 0.001 | 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".