Figure 3
Experimental momentum distributions along the laser polarization direction.
The measured pz momentum distributions of O2, N2 and CO2 are shown in the intensities of 0.2–1 × 1014 W/cm2 at 1320 nm. The Keldysh parameters are shown by the labels. The curves are separated slightly in the vertical direction for visual convenience. The gray dashed lines show the position pz = 0. One can find that it is an interference minimum for O2 and CO2 and a maximum for N2 when pz = 0.
