Tian Yu-Ming, Wang Kai-Yue, Li Zhi-Hong, Zhu Yu-Mei, Chai Yue-Sheng, Zeng Yu-Shun, Wang Qiang. Effect of high-energy electron exposure on the charge states of defects in diamondJ. Acta Physica Sinica, 2013, 62(18): 188101. DOI: 10.7498/aps.62.188101