Femtosecond time-resolved measurements of interband transition in ultrathin gold foils under ultrafast excitation
Bibliographic record
Abstract
Summary form only given. The advance in ultrafast laser technology has enabled the observation of transient processes in many areas. One interesting phenomenon is laser-induced phase transition from solid to plasma. A detailed study of this could bridge the gap between condensed matter physics and plasma physics. A recent experiment on femtosecond laser heating of ultrathin freestanding gold foils revealed a quasi-steady-state behavior before the onset of hydrodynamic expansion. Further investigations with frequency domain interferometry (FDI) yielded the time scale of such a state, which agrees well with the electron-phonon coupling time calculated from a simple Two-Temperature Model (TTM). To provide further insight into the processes of electron-electron and electron-phonon relaxation, a fs wavelength-tunable probe generated by an optical parametric amplifier is used to follow the temporal evolution of interband transition in gold (5d-6s/p) under intense laser excitation through transient reflectivity and transmissivity measurements. The comparison of the measurements and the model calculation will be discussed.
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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".