Second-harmonic generation and the shock sensitivity of TATB

The recent discovery of significant differences in second-harmonic generation (SHG) from various grades of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) prompted an investigation into the sensitivity of TATB based upon the crystal structure and morphology as indicated by SHG intensity. The Floret test was used as a means for rank ordering the shock sensitivity properties of fine TATB samples. Two types of TATB, which showed low SHG and performed poorly, were heated to obtain a much higher level of SHG, and then tested to compare sensitivities. One of the samples was significantly desensitized, and the sensitivity of the other was unchanged. Interpretations are presented which attempt to explain the relationship of SHG to the shock sensitivity of TATB. Although particle size and pressing density appear to be the main drivers for shock sensitivity, SHG intensity evaluations may help explain departures from those trends.