Abstract
The ionization dependences of triatomic molecular ions exposed to ultra-short intense laser fields on the bond extension, the laser frequency, intensity and pulse envelope have been investigated numerically. We find that the ionization of is greatly enhanced when one of the two bonds stretches into a critical bond length range -6 bohr for the laser intensity . Moreover, the enhanced ionization is laser-frequency dependent, namely, the critical bond length shifts toward a small value for the short-wavelength excitation. In addition, the critical bond length is found to be variable with the laser intensity. For low-frequency excitations, the enhanced ionization (EI) effect can be explained by the field-induced over-the-barrier model. However, the EI effect is attributed to the resonance-enhanced multiphoton ionization mechanism for high-frequency (248 nm) excitation.
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