Institution: | 1. An Giang University – VNUHCM, 18-Ung Van Khiem Street, Long Xuyen, An Giang, Viet Nam;2. Atomic Molecular and Optical Physics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam |