The determination of the Forster critical radius through time-dependent fluorescence decay measurements and the spectral overlap method
Bibliographic record
Abstract
The Forster distance (R0), a quantity whose accurate evaluation is essential for studies of diblock copolymer interfaces using non-radiative resonance energy transfer, was determined for two phenanthrene derivatives as donor paired with a series of anthracene acceptors in poly(methylmethacrylate) and polystyrene films as well as in ethyl acetate solution. The values of R0 were calculated by independently measuring the fluorescence quantum yield of the donor, the fluorescence emission spectrum of the donor, and the extinction coefficient spectrum of the acceptor and compared with those determined by fitting the time-dependent fluorescence decay to an equation derived by Forster. A technique was devised for measuring the extinction coefficient spectra of molecules embedded in polymer matrices. Strategies for dealing with the problem of background fluorescence in time-dependent experiments were developed. The dependence of R0 on the refractive index of the medium was also examined.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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".