Structural Deformation of CO₂²⁺ in Intense Femtosecond Laser Fields

The angular distributions of CO⁺ from the dissociation of CO₂²⁺ and CO₂⁺ in intense femtosecond laser fields (45fs, about 5×10¹⁵ W/cm²) are studied at a laser wavelength of 800nm based on the time-of-flight mass spectra of CO⁺ fragment ions. The experimental results show that structural deformation occurs in the charge state of CO₂²⁺ and the CO₂⁺ maintains linear geometrical structure.