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Cross sections for the dissociative excitation of H i by electrons have been measured for interaction energies between 25.4 and 715eV. A source was used which produced H; ions under clearly defined conditions. Over the whole energy range, the measurements agree very closely with values obtained by averaging the theoretical cross sections of Peek in 1967 and Peek and Green in 1969 over a vibrational population given by Franck-Condon factors between hydrogen and H i .

P-p'-dioxydiphenylsulpfone, p-nitro--p'-methylbenzylidenaniline, 3-metoxy-4--oxybenzaldehyde crystals are obtained of high optical quality. Refraction index dispersion, nonlinear susceptibility tensor components values, symmetry classes are determined. It is shown that the crystals posses high nonlinear susceptibility along with wide range of transparency and high laser damage threshold. A new method is considered of nonlinear susceptibility measurements.

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