Attosecond molecular Coulomb explosion

(a) Autocorrelation trace of an attosecond pulse train synthesized by the time-of-flight mass spectra of N2 recorded as a function of the delay Δt of one of the two separated harmonic beams. The delay Δt is expressed in units of one cycle of fundamental laser light T0. (b) Ion signal intensities of the two side-peak areas marked as 'S' in the range specified by an arrow is plotted as a function of Δt. (c) Ion signal intensities in the central-peak area 'C' in the range specified by an arrow is plotted as a function of Δt. (d) Autocorrelation trace of the fundamental laser light measured by detecting the fragment ions N+ generated by exposing N2 only to the intense fundamental light field at 800 nm.