Stable structure and optical properties of fused silica with NBOHC-E′ defect
Lu Peng-Fei1, 2, †, , Wu Li-Yuan1, Yang Yang1, Wang Wei-Zheng1, Zhang Chun-Fang3, Yang Chuang-Hua4, Su Rui3, Chen Jun5
       

Different variations of ɛimag with energy in the three directions of three configurations for different Si1–O1 bond lengths.