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High-order harmonic generation, HOHG, resulting from the interaction of intense ultrashort laser pulses with atoms has been extensively studied in recent years offering potential application as a source of coherent ultrashort radiation in the extreme ultraviolet and soft Xray regions.1-3 For molecules, molecular high order harmonic generation, MHOHG3 offers the possibility of synthesizing attosecond (1 attosecond=10-18 second) pulses for creating and controlling coherent electron wavepackets, CEWP.4 An intuitive and efficient theoretical picture based on a classical three step electron recombination trajectory5-6 model in the laser field has helped to elucidate this process. According to this model, an electron tunnels out from the atom or molecule and may recombine with the parent5,7 or neighbouring8 ion emitting a high energy photon, after undergoing laser–driven motion in the continuum. If the tunnelling electron under the laser field does not return to the parent ion position, it is completely ionized and this is referred to as molecular ionization. The electron can also recombine with a neighbouring ion, an example of laser induced electron transfer, LIET.9 Theoretical and experimental work on HOHG has been mostly devoted to atoms. The study of MHOHG in molecules is at the early stages. In contrast to atoms, for molecules, the returning wave packet in the semiclassical picture of HOHG encounters a core comprising two or more nuclei, which are presumed to behave as pointlike source potentials leading to interference in the MHOHG spectrum. Additionally, it has been suggested that the electron recollision crosssections responsible for MHOHG relates to the projection of the valence orbitals with respect to the direction of the propagation of the recolliding electron, making possible a new molecular orbital tomography10. It is therefore, natural to ask if there is any orientation

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Non Perturbative Time-Dependent Density Functional Theory, TDDFT: Study of Ionization and Harmonic Generation in Linear Di-(N&amp;#8322;) and Tri-(CO&amp;#8322;, OCS, CS&amp;#8322;) Atomic Molecules with Ultrashort Intense Laser Pulses-Orientational Effects