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Bibliographic record
Abstract
Excitation and fluorescence ultraviolet spectra of ${\mathrm{Cd}}_{2}$ recorded at the ${}^{1}{0}_{u}^{+}(5{}^{1}{P}_{1})--X{}^{1}{0}_{g}^{+}$ transition are reported. The ${\mathrm{Cd}}_{2}$ molecules (seeded in Ar) produced in a continuous free-jet supersonic beam were excited in a vacuum chamber with a pulsed dye-laser beam. A well-resolved vibrational structure of the ${}^{1}{0}_{u}^{+}\ensuremath{\leftarrow}X{}^{1}{0}_{g}^{+}$ excitation spectrum as well as the isotopic structure of the vibrational components were recorded. Analysis of the spectrum yielded vibrational constants for the ${}^{1}{0}_{u}^{+}$ state: ${\ensuremath{\omega}}_{e}^{\ensuremath{'}}=100.50\ifmmode\pm\else\textpm\fi{}0.25{\mathrm{cm}}^{\ensuremath{-}1},$ ${\ensuremath{\omega}}_{e}^{\ensuremath{'}}{x}_{e}^{\ensuremath{'}}=0.325\ifmmode\pm\else\textpm\fi{}0.003{\mathrm{cm}}^{\ensuremath{-}1},$ ${D}_{0}^{\ensuremath{'}}=8638\ifmmode\pm\else\textpm\fi{}15{\mathrm{cm}}^{\ensuremath{-}1},$ ${D}_{e}^{\ensuremath{'}}=8688\ifmmode\pm\else\textpm\fi{}15{\mathrm{cm}}^{\ensuremath{-}1},$ and $\ensuremath{\Delta}{R}_{e}{=R}_{e}^{\ensuremath{''}}\ensuremath{-}{R}_{e}^{\ensuremath{'}}=1.04\ifmmode\pm\else\textpm\fi{}0.01\AA{}$ derived for the ${}^{226}{\mathrm{Cd}}_{2}$ isotopomer. The ${}^{1}{0}_{u}^{+}$ state potential-energy (PE) curve was obtained numerically using an inverse perturbation approach (IPA) procedure. Condon internal diffraction (CID) patterns in the ${}^{1}{0}_{u}^{+}\ensuremath{\rightarrow}X{}^{1}{0}_{g}^{+}$ fluorescence band, emitted upon the selective excitation of the ${v}^{\ensuremath{'}}=38$ and ${v}^{\ensuremath{'}}=39$ vibrational components of the ${}^{226}{\mathrm{Cd}}_{2}$ isotopomer, were observed and improved the ${v}^{\ensuremath{'}}$ assignments derived from the analysis of the isotopic structure. Analysis of the fluorescence spectrum yielded information on the repulsive part of the ground-state interatomic potential. The result confirms a relatively soft repulsion between two Cd atoms in the short-range (2.53--4.05 \AA{}) region and makes allowance for a covalent admixture to the ground-state van der Waals bonding. Quasirelativistic valence ab initio calculations on the PE curves for the investigated states have been performed at the complete-active-space multiconfiguration self-consistent-field (CASSCF/CAS) multireference second-order perturbation theory (CASPT2) level with the total of 40 correlated electrons. In the calculations, the Cd atom is considered as a 20-valence electron system whereas the ${\mathrm{Cd}}^{20+}$ core is replaced by an energy-consistent pseudopotential which also accounts for scalar-relativistic effects and spin-orbit interaction within the valence shell. A comparison with results obtained from other experiments and ab initio calculations is presented.
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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 | 0.014 | 0.016 |
| Meta-epidemiology (narrow) | 0.009 | 0.019 |
| Meta-epidemiology (broad) | 0.003 | 0.018 |
| Bibliometrics | 0.006 | 0.013 |
| Science and technology studies | 0.012 | 0.018 |
| Scholarly communication | 0.012 | 0.013 |
| Open science | 0.020 | 0.017 |
| Research integrity | 0.019 | 0.016 |
| Insufficient payload (model declined to judge) | 0.973 | 0.013 |
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; both teacher heads agree on what is shown here.
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".