Cutoff in molecular harmonic-generation spectra resulting from classical chaotic dynamics

The plateau in the harmonic-generation (HG) spectrum of a bound quantum system is first associated with classical chaotic dynamics. The molecular cutoff in the HG spectra was obtained at {Ω}=m{ω}, where {ω} is the frequency of the time-periodic field and m is the area of the bound chaotic region in the phase space divided by 2{π}{}.