Abstract
We report experimental studies of double ionization of C 2H 4 and C 2H 6 molecules irradiated by 810 nm, 130 fs pulses at intensity of 10 15–10 16 W/cm 2. The laser intensity dependent ratios X 2+/X + (X denoted C 2H 4 or C 2H 6) are measured for both linearly polarized and circularly polarized lights to determine the double ionization mechanism. The result is contrary to the prediction of the rescattering model, which demonstrates that the molecular structure should be taken into account to deal with the nonsequential double ionization of molecules.
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