(color online) (a) Plots of maximal orientation degree 〈 cos θ 〉 max versus the amplitude of the two-color laser pulse of LiH (black line) and HBr (red line). Plots of rotational population versus amplitude of the two-color laser pulse for (b) LiH and (c) HBr after laser pulse, respectively. The parameters are the same as those in Fig. 1 except for σ_r = 4 ps.