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We investigate the orientation dependence of molecular high-order harmonicgeneration (HHG) both numerically and analytically. We show that the molecularrecollision electronic wave packets (REWPs) in the HHG are closely related tothe ionization potential as well as the particular orbital from which itionized. As a result, the spectral amplitude of the molecular REWP can besignificantly different from its reference atom (i.e., with the same ionizationpotential as the molecule under study) in some energy regions due to theinterference between the atomic cores of the molecules. This finding isimportant for molecular orbital tomography using HHG[Nature \textbf{432},867(2004)].

High-Order Harmonic Generation and Molecular Orbital Tomography: Characteristics of Molecular Recollision Electronic Wave Packets