A Comparison of the Importance of Electron-Stimulated Desorption of Sodium at Mercury and the Moon
Bibliographic record
Abstract
We revisit the importance of Electron-Stimulated Desorption (ESD) as a source of neutral Na atoms and Na+ ions in the exospheres of Mercury and the Moon. For the first time we have calibrated the ESD yield per electron as a function of electron energy in the energy range 100 - 950 eV. This calibrated yield per electron was convolved with the electron flux as a function of energy onto Mercury's cusps to determine the average release rate of Na+ to the exosphere, using electron flux and cusp area estimates from a recent hybrid magnetosphere model (Lavorenti et al., 2023). Given that previous work showed the ESD yields of ions and neutral atoms are approximately equal, we compared the energy-weighted ESD release rate of Na+ to that derived from impact vaporization, photon-stimulated desorption, and ion-sputtering. We conclude that ESD is not a significant source of neutral Na atoms or Na+ ions to Mercury's exosphere. The electron flux and open regions are quite different at the Moon. The lunar surface is open to the solar wind since the Moon does not have a global magnetic field. The electron flux onto the Moon is taken from Artemis data.
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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) | 0.000 | 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 | 0.001 |
| Open science | 0.000 | 0.001 |
| 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 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".