Source X-UV pour la spectroscopie d'absorption en régime femtoseconde
Bibliographic record
Abstract
Les processus dynamiques se produisant lors de transitions de phase ultra-rapide peuvent tre dduits partir de mesures de diffraction ou d'absorption de rayonnement X. Les lasers femtosecondes ont rcemment t utiliss pour tudier la dynamiques de la matire au moyen d'une pompe optique et d'une sonde X : du rayonnement X K alpha produit par interaction laser plasma. Nous prsentons nos plus rcents rsultats concernant le dveloppement d'un sytme de spectroscopie d'absorption du rayonnement X (XAS) base sur une source laser-plasma large bande dans la gamme 1-5 nm permettant d'atteindre une rsolution temporelle femtoseconde. Le systme est conu pour sonder les dynamiques lectroniques ayant lieu durant la transion de phase semiconducteur-mtal du dyoxide de vanadium (VO2) lorsque celle-ci est initie par une impulsion laser femtoseconde. Dans la prsente exprience, un spectre large bande proche du seuil L du vanadium (511 eV) et du seuil K de l'oxygne (525 eV) du VO2 a t gnr et mesur avec un haut rapport signal sur bruit (100), une grande rsolution spectrale ( E/E = 4.2 10 -3 ), et une rsolution temporelle de 1,2 ps.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.026 | 0.005 |
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".