Abstract
We perform an experimental study on comparison between the ionization of homonuclear diatomic molecules (${\mathrm{O}}_{2}$ and ${\mathrm{N}}_{2}$) and their companion atoms (Xe and Ar) radiated by circularly polarized intense laser fields. We find that the ionization of ${\mathrm{O}}_{2}$ shows suppression with respect to its companion atom Xe, which exhibits a clear wavelength and intensity dependence similar to that in linearly polarized laser field, while the ionization of ${\mathrm{N}}_{2}$ behaves like its companion atom Ar. With the help of $S$-matrix theoretical analysis, our observations can be attributed to both the molecular orbital and the two-center interference effect in molecular ionization process.
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