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The generation of high-order harmonics and single attosecond pulses from H2+ $$ {H}_2^{+} $$ has been theoretically investigated beyond the Born–Oppenheimer approximations. It is found that with the introduction of the inhomogeneous effects of the laser field in frequency and space, not only the harmonic cutoff can be remarkably enhanced, but also the single short quantum path can be selected. Further,...
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