Proton spin-lattice relaxation time in the superconducting intercalation complex Tas2(pyridine)1/2
Proton NMR in TaS2(pyridine)1/2 shows that pyridine molecules form a rigid lattice with slow molecular motions up to 300 K. The protons' T1 is associated with interactions between the metallic layers and the molecular layers at least above 80 K. An anomalous T1 plateau below 80 K might tentatively be attributed to the occurrence of charge density waves. Below TC a large increase of T-11 has been observed in a single crystal sample.
We present what is to our knowledge the most complete 1-D numerical analysis of the evolution and the propagation ::: dynamics of an ultrashort laser pulse in a Ti:Sapphire laser oscillator. This study confirms the dispersion ::: managed model of mode-locking, and emphasizes the role of the Kerr nonlinearity in generating mode-locked ::: spectra with a smooth and well-behaved spectral phase. A very good agreement with experimental measurements ::: of pulse energy, spectrum, and temporal width of extracavity compressed pulses is found.