Abstract
The field ionization and Coulomb explosion of diatomic carbon monoxideinteracting with intense femtosecond laser pulses was systematically investigatedby using a time-of-flight mass spectrometer. The kinetic energy release (KER) in aCoulomb explosion causes the atomic ions to exhibit a double-peak structure. Thevalues of KER calculated using a two-step model were found to agree well withthe measured ones. The distributions of atomic ions are highly anisotropic, havinga maximum along the laser polarization axis and a minimum perpendicular toit. In contrast to the atomic ions, the parent ion CO+exhibits a strong isotropic angular distribution. Suppression of ionization wasobserved for circularly polarized pulses, indicating that the dynamic alignment isresponsible for the observed anisotropic angular distribution of the atomic ions.
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