Non-sequential double ionization of triatomic molecules OCS in intense laser fields

摘要

We investigated the non-sequential double ionization of the OCS molecule at both 800 nm and 1200 nm laser fields. For the double ionization with different laser wavelengths, an alternating high and low yields were observed in the yields dependence on the laser intensity. To get insight of this phenomenon, the mechanisms of the strong field double ionization were analyzed in details. An abnormal change of the mechanism was identified at 1200 nm laser fields as the laser intensity increases. With further discussions, the influence of laser wavelength on the NSDI was studied.