A comparative study of the second harmonic generation at the M(H2,Ni(II),V=O)-porphyrin/glass interface in a total reflection geometry is presented. The state of polarization of the incident pulses was changed by a computer controlled rotation of a quarter wave plate. The rotation patterns obtained from the experimental data were fit to a Fourier series based upon theoretical Fourier coefficients. Complex valued components of the superficial susceptibility tensor are showed. From these values, average tilt angles concentration dependent were obtained. A different behavior for each Metalloporphyrin was observed.
Resonant molecular optical second harmonic generation (SHG) has been obtained from [2, 3, 7, 8, 12, 13, 17, 18- Octaethyl-porphinato] vanadyl, (OEP)V=O, adsorbed on the hypotenuse face of a glass prism. Rotational intensity patterns are showed by plotting the second harmonic intensity as a function of the incident polarization angle of the fundamental wave, at a fixed angle of incidence. Evaluation of these patterns by Fourier analysis allowed the determination of the second order susceptibilities components of the adsorbed layers. Assuming a delta distribution function, the mean orientation angles from normal to the surface plane, were obtained for different solution concentrations. Our results indicate an abrupt change in the angle for two concentration ranges.
Resonant molecular optical second harmonic generation (SHG) was obtained from(2, 3, 7, 8, 12, 13, 17, 18-Octaethyl- porphinato)M, with M equals none, vanadyl and Ni(II), adsorbed onto fused silica substrates. The polarization dependence of the SHG signals at 1064 nm allowed the determination of average molecular orientations. For the vanadium porphyrin the average angle between the long axis molecules and the surface normal was 38 degrees, while, for the Nickel porphyrin, and the non-metal porphyrin the angle was close to 0 degrees. These results can be understood in terms of the different symmetries of the molecules.
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