Abstract
Single and double electron ionization probabilities are calculated numerically for the first three electronic states of a 1D model of H2 in an ultrashort (t < 10 fs) intense (I ⩾ 1014 W cm−2) longwavelength (λ = 800 nm) laser pulse. High order harmonic generation spectra are also presented in intensity regimes where single and double ionizations dominate. Numerical results are presented at equilibrium and at the critical internuclear distance Rc where charge resonance enhanced ionization, CREI, occurs. Comparison of the harmonic generation plateaus at different intensities and the two different internuclear distances allows for an evaluation of the influence of electron correlation and symmetry of the two-electron wavefunction.
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