Optical Second Harmonic Generation Study of Malachite Green Orientation and Order at the Fused-Silica/Air Interface
Bibliographic record
Abstract
Optical second harmonic generation (SHG) studies of malachite green (MG) adsorbed at the fused-silica/air interface have been conducted. The concentration dependence of the second harmonic intensity indicates the formation of ordered monolayers normal to the interface. Polarization SHG experiments have been used to extract the averaged molecular orientation in adjacent molecular layers and to characterize the breadth of the orientation distribution. MG adsorbs in an upright orientation with its molecular plane near normal to the surface. This orientation is consistent with the interaction of the polar surface and the polar dimethylamino substituents of the adsorbate. Molecular orientation in the second monolayer resembles that in the first, but also reflects some additional broadening of the orientation distribution function. The onset of parallel, sandwich-type aggregates has been observed within the first monolayer. The formation of parallel, sandwich-type, intralayer aggregates is distinct from the interlayer aggregation observed between adjacent monolayers of rhodamine 6G. These differences result from the nature of the molecule−surface interactions that define their respective orientations in the first monolayer. Thus, it appears that the order observed in these ultrathin organic films is dictated by the molecule−surface interactions within the first monolayer as well as the magnitude of the intermolecular interactions in subsequent layers.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".