Filters: Date: "1997-01" Collection: ir_uspace
1 - 25 of 3
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
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Vardeny, Zeev Valentine | Cooperative emission in ∏-conjugated polymer thin films | Picosecond dynamics of exciton emission and absorption have been studied in neat thin films of a variety of poly (phenylene vinylene) derivatives. We found that the stimulated emission band of 120 nm width and ~1 ns duration, which is observed at low exciton density n, collapses at n > 1017 cm-3 int... | Pi-conjugated polymers; Poly (phenylene vinylene) derivatives; PPV derivatives; Cooperative emission | 1997-01 |
| 2 |
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Vardeny, Zeev Valentine | Optical absorption in the substituted phenylene-based conjugated polymers: theory and experiment | We investigate theoretically and experimentally the effects of (2,5) chemical substitution on the optical absorption in the phenylene-based conjugated polymers. Theoretically, substitution destroys both the charge-conjugation symmetry and spatial symmetry that characterize the unsubstituted materia... | Phenylene-based conjugated polymers; Optical absorption; Chemical substitution; Coulomb correlated models | 1997-01 |
| 3 |
 |
DeTar, Carleton | Which chiral symmetry is restored in high temperature quantum chromodynamics? | Sigma models for the high temperature phase transition in quantum chromodynamics suggest that at high temperature the SU(Nf) X 3 SU(Nf) chiral symmetry becomes exact, but the anomalous axial U(1) symmetry need not be restored. In numerical lattice simulations, traditional methods for detecting symme... | Chiral symmetry; Staggered fermions; Phase transitions | 1997-01 |
1 - 25 of 3