Abstract
Tunneling ionization of vibrationally excited CS2 molecules in their ground electronic state is calculated using molecular orbital Ammosov–Delone–Krainov theory (MO-ADK) considering bond length-dependence and bond angle-dependence. The tunneling ionization rates and the corresponding electron density are calculated respectively for different initial states. A relationship between laser intensity and the molecular orientation angle is determined and compared with experimental results, showing excellent agreement. Our calculations show that the primary contribution of vibration effect to CS2 in tunneling ionization is due to the symmetric expansion mode.
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