High-order harmonic generation at long range in intense laser pulses

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Abstract
The physics of high-order harmonic generation in single-electron molecular ions at long range (large internuclear distances) is examined by exact numerical solutions of the three-dimensional time-dependent Schrödinger equation. These numerical solutions show that photon energies can be produced with energies exceeding the atomic cut-off law , where is the ionization energy and is the ponderomotive energy. It is shown that preferential high-order harmonic generation occurs at critical distances , and , where is the ponderomotive radius, by collision of electrons with neighbouring ions as opposed to recollision with the parent ion. The most efficient harmonic generation occurs at due to less electron wavefunction expansion.