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Recent measurements on high-order harmonic generation (HHG) from N$_2$aligned perpendicular to the driving laser polarization [B. K. McFarland {\itel al}, Science {\bf 322}, 1232 (2008)] have shown a maximum at the rotationalhalf-revival. This has been interpreted as the signature of the HHGcontribution from the molecular orbital just below the highest occupiedmolecular orbital (HOMO). By using the recently developed quantitativerescattering theory combined with accurate photoionization transition dipoles,we show that the maximum at the rotational half-revival is indeed associatedwith the HOMO-1 contribution. Our results also show that the HOMO-1contribution becomes increasingly more important near the HHG cutoff andtherefore depends on the laser intensity.

Uncovering multiple orbitals influence in high harmonic generation from aligned N$_2$