A review of material surface processing utilizing gas cluster ion beam technology Zihao Lin, Xiangzhi Li, Guanglong Chen, Peilei Zhang, Yunjiu Cao, Li Ren, Huili Shao and Xinxin Zhao Eur. Phys. J. D, 79 5 (2025) 50 Published online: 11 May 2025 DOI: 10.1140/epjd/s10053-025-01002-0