Fixed three-dimensional holographic images.

Three-dimensional holograms were recorded in a cerium-doped, strontium barium niobate (SBN:75) photorefractive crystal. These holograms are shown to not degrade after more than one week of continuous readout and to reconstruct reproductions of the original object with an observable field of view of approximately 35 degrees.

Synthesis, Characterization, and Explosive Properties of the Nitrogen-Rich Borazine [H(3)N(3)B(3)(N(3))(3)].

The azidoborazines [Me(3)N(3)B(2)(Me)(2)B(N(3))] and [H(3)N(3)B(3)(N(3))(3)] were prepared from the combination of Me(3)SiN(3) and the chloroborazines [Me(3)N(3)B(2)(Me)(2)BCl] and (H(3)N(3)B(3)Cl(3)). The compounds have been characterized by analytical and spectroscopic methods. The molecular structure of [H(3)N(3)B(3)(N(3))(3)] has been confirmed by single-crystal X-ray diffraction techniques: triclinic space group P&onemacr; with a = 8.579(1) Å, b = 9.182(1) Å, c = 12.043(1) Å, alpha = 104.62(1) degrees, beta = 90.26(1) degrees, gamma = 110.74(1) degrees, and Z = 4. The thermal behavior of the azides have been examined by TGA/DTA. The explosion sensitivity of [H(3)N(3)B(3)(N(3))(3)], which contains 82.58% nitrogen by weight, has been accessed by drop weight impact, spark, and friction tests. These measurements indicate that [H(3)N(3)B(3)(N(3))(3)] is a relatively sensitive explosive. The Staudinger reactivity of the azides with Ph(3)P was examined, and [H(3)N(3)B(3)(N(3))(3)] was found to produce [Ph(3)P=NH(2)](N(3)). The molecular structure of this compound was determined by single-crystal X-ray diffraction techniques: orthorhombic space group P2(1)2(1)2(1) with a = 10.649(2) Å, b = 11.737(3) Å, c = 13.364(4) Å, alpha = beta = gamma = 90 degrees, Z = 4.