Fig. 1. A sketch of laser field and CO molecule orientation

Fig. 2. Ionization rates of CO molecules with different orientations

Fig. 3. Variation of ionization rate with relative phase at different molecular orientations. (a) θ=0°; (b) θ=180°

Fig. 4. Attosecond pulses with different relative phases. (a) θ=0°; (b) θ=180°

Fig. 5. Time-frequency analyses of harmonics. (a) θ=0°,Δφ=0; (b) θ=0°,Δφ=π; (c) θ=180°,Δφ=π/2; (d) θ=180°,Δφ=π

Fig. 6. Variation of ionization rate with relative phase under different molecular orientations. (a) θ=0°; (b) θ=180°

Fig. 7. Attosecond pulses at different molecular orientations and relative phases