Intact molecular ion formation of cyclohexane and 2,3-dimethyl-1,3-butadiene by excitation with a short, intense femtosecond laser pulse

Cyclohexane was ionized and fragmented at a typical intensity of 4 × 1013 W cm−2 at 15 fs with 0.8 μm femtosecond pulses as shown in the figure. Short pulse excitation is effective to produce molecular ion and that the mechanisms should be analyzed.