Abstract

The linear electro-optic (Pockels) effect has been measured in the organic molecular crystal hexamethyl-enetetramine. Crystals were grown from water, alcohol, and chloroform solutions and from the vapor. Electro-optic coefficients computed from Sénarmont-compensator data range from 0.71 × 10<sup>-10</sup> cm V<sup>-1</sup> to 0.8 × 10<sup>-10</sup> cm V<sup>-1</sup> or, equivalently, in terms of half-wave voltage: <i>V</i><sub>1/2λ</sub>= 85±5 kV. Crystal strain is not responsible for the much wider variation reported in the literature. Electric-field inhomogeneities are considered a more likely cause.

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