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Non-sequential double recombination (NSDR) high-order harmonic generation(HHG) is studied in a molecular system. We observe a unique moleculartwo-electron effect with a characteristic cutoff in the HHG spectrum at higherenergies than what was previously seen for NSDR HHG in atoms. The effect iscorroborated with a classical model where it is found that the effect issensitive to the molecular potential and originates from same period emissionand recombination (SPEaR) of two electrons. The effect persists forintermediate nuclear distances of $R \gtrsim 8.0$ a.u.

Same Period Emission and Recombination in Non-Sequential Double Recombination High-Harmonic Generation in H$_2$