Ruiz-Caballero José L, Aparicio-Bolaño Joaquín A, Figueroa-Navedo Amanda M, Pacheco-Londoño Leonardo C, Hernandez-Rivera Samuel P
1 ALERT DHS Center of Excellence for Explosives Research, Department of Chemistry, University of Puerto Rico, Mayagüez, PR, USA.
2 Department of Physics, University of Puerto Rico, Ponce, PR, USA.
Appl Spectrosc. 2017 Aug;71(8):1990-2000. doi: 10.1177/0003702817710248. Epub 2017 May 24.
The optical properties for crystalline films of the highly energetic material (HEM) hexahydro-1,3,5-trinitro-s-triazine, which is also known as RDX, deposited on gold (Au) and stainless steel (SS) substrates are presented. RDX has two important stable conformational polymorphs at room temperature: α-RDX and β-RDX. The optical properties obtained in the present work correspond to thin film samples of predominantly β-RDX polymorph. The infrared spectroscopic intensities measured showed significant differences in the β-RDX crystalline films deposited on the two substrates with respect to the calculated real part of refractive index. The β-RDX/Au crystalline films have a high dynamic response, which is characterized by the asymmetric stretching mode of the axial nitro groups, whereas for the β-RDX/SS crystalline films, the dynamic response was mediated by the -N-NO symmetric stretch mode. This result provides an idea of how the electric field vector propagates through the β-RDX crystalline films deposited on the two substrates.
本文介绍了高能材料（HEM）六氢-1,3,5-三硝基-s-三嗪（又称RDX）沉积在金（Au）和不锈钢（SS）基底上的晶体薄膜的光学性质。RDX在室温下有两种重要的稳定构象多晶型物：α-RDX和β-RDX。本工作中获得的光学性质对应于主要为β-RDX多晶型的薄膜样品。测量的红外光谱强度显示，沉积在两种基底上的β-RDX晶体薄膜在计算的折射率实部方面存在显著差异。β-RDX/Au晶体薄膜具有高动态响应，其特征是轴向硝基的不对称拉伸模式，而对于β-RDX/SS晶体薄膜，动态响应由-N-NO对称拉伸模式介导。这一结果提供了关于电场矢量如何通过沉积在两种基底上的β-RDX晶体薄膜传播的思路。
