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The experimental observation of spin waves by NMR spectroscopy is reported for a linear chain consisting of five scalar coupled 13 C spins of lysine. Selective excitation of a first spin and evolution under an effective planar zero-quantum Hamiltonian with terms 2 π J i,i+1 (I ix I i+1,x +I ...
The nonlinear absorption and refraction of octasubstituted metallophthalocyanines (R 8 PcM: M = 2H, Cu) in solution is measured in the picosecond regime by the Z-scan technique at a wavelength of 1.064 μm. The results at different pulsewidths show that the nonlinear absorption process is dominated by two-photon absorption in the metal-free compound, and by excited state absorption in the Cu-substituted...
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