Field-free orientation of CO molecule by combining two-color femtosecond laser pulse with time-delayed positively chirped laser pulseHong-Cai Tao, Shuo Wang, Wei-Shen Zhan, Ce Hao and Hui-Fang LiEur. Phys. J. D, 72 8 (2018) 141DOI: https://doi.org/10.1140/epjd/e2018-80788-4