by Intense Laser Pulses*

Employing a coincidence three-dimensional momentum imaging technique, we investigate the ultrafast, intense laser-induced ionization of CS⁺.  The analysis presented here focuses on the intensity-dependent branching ratio from 3×10¹⁴  to 3×10¹⁶ W/cm².  The charge-symmetric C⁺ + S⁺ channel is dominant at all measured intensities, followed by CS²⁺ and then C + S²⁺, while C²⁺ + S is not observed.  The branching ratio measurement is assisted by in situ determination of the detection efficiency of all the product channels.