美国橡树岭国家实验室(ORNL)能源所的一个国际研究小组称，采用正电子检测到了位于金纳米颗粒表面上的四原子空位簇，金颗粒嵌在镁基体中。空位簇解释了不同制备工艺引起的材料光学性能的改变。过去由于无法对空位进行检测，严重制约了新材料及高性能材料的开发，如新一代光电 An international team at the ORNL Energy Institute said using positrons detected clusters of four-atom vacancies on the surface of gold nanoparticles embedded in a magnesium matrix. Gap clusters explain the changes in the optical properties of materials caused by different fabrication processes. In the past due to the inability to detect vacancies, severely restricted the development of new materials and high performance materials, such as a new generation of optoelectronics