Low energy (1–19 eV) electron scattering from condensed thymidine (dT) II: comparison of vibrational excitation cross sections with those of tetrahydrofuran and the recalibrated values of thymine
Bibliographic record
Abstract
Recent measurements of absolute vibrational cross sections (CSs) for low-energy electron (LEE) scattering from condensed thymidine (dT) allows comparison with CSs of its constituents; thymine and tetrahydrofuran (THF). To facilitate this comparison, the vibrational CSs of condensed thymine were remeasured at six electron incident energies and a correction was applied to the earlier thymine CS values measured by Lévesque et al. [Nucl. Instrum. Methods Phys. Res., Sect. B, 2003, 208, 225]. The incident energy dependence of the CS of each vibrational mode of dT is compared with the corresponding modes in thymine and/or THF. It is found that the magnitude of the CSs of the thymine breathing mode and the C-C stretch mode of THF are greatly attenuated in dT. Finally, the magnitudes of the total vibrational CSs of each molecule are compared. Below 4 eV, the total vibrational CSs of dT is greater than each of its two constituents. Interestingly, at higher energy (>6 eV), the magnitude of the total vibrational CS of dT is roughly equal to that of THF and is greater than thymine by only 15% at 10 eV, showing that the CSs of dT cannot be approximated by the addition of the CSs of its constituents over the entire energy range. These comparisons are discussed in terms of the basic principles involved in the formation and decay of shape resonances, which are known to be responsible for major enhancements of LEE-induced vibrational excitation at low electron energies.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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".