Abstract
An electron–ion coincidence momentum imaging apparatus has been developed and applied to dissociative ionization of CS 2 in ultrashort intense laser fields. Photoelectron images of CS 2 in 35 fs intense laser fields (2 × 10 13 W/cm 2, 800 nm, linearly polarized) recorded in coincidence with the parent ion, CS 2 +, show clear concentric ring patterns due to the above-threshold ionization (ATI) process. On the other hand, broad structureless distributions elongated along the direction of the laser polarization are observed in the coincidence electron images for the CS + and S + fragment ions. The difference in the electron images indicates that the dissociative ionization does not proceed sequentially by the formation and photodissociation of CS 2 + in intense laser fields.
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