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Odd-even harmonic emission from oriented NO molecule with nodal planes.

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    Investigating high-harmonic generation (HHG) in oriented NO molecules reveals that molecular structure, specifically nodal planes, significantly influences odd-even harmonic emissions. The orientation of asymmetric molecules dictates the main emission channels for these harmonics.

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    Area of Science:

    • Quantum optics
    • Molecular physics
    • Attosecond science

    Background:

    • High-harmonic generation (HHG) is a key process for producing ultrashort light pulses.
    • Understanding HHG in molecules is crucial for probing molecular electronic structure and dynamics.
    • Asymmetric molecules and their orientation introduce complex phenomena in HHG.

    Purpose of the Study:

    • To investigate the odd-even high-harmonic generation (HHG) in oriented asymmetric NO molecules.
    • To analyze the influence of molecular structure, particularly nodal planes, on HHG.
    • To understand the role of molecular orientation in controlling parallel and perpendicular harmonic emissions.

    Main Methods:

    • Numerical simulations of HHG in oriented NO molecules.
    • Analysis of harmonic emission yields parallel and perpendicular to laser polarization.
    • Development and application of a simplified odd-even HHG model.

    Main Results:

    • The relative yields of parallel and perpendicular odd-even harmonics are sensitive to molecular orientation.
    • The nodal plane of the NO molecule significantly alters the main emission channels for odd-even HHG.
    • The findings are consistent with a model considering the symmetry of the laser-driven asymmetric system.

    Conclusions:

    • Molecular nodal planes are critical in determining the mechanism of odd-even HHG in asymmetric molecules.
    • Molecular orientation provides a means to control the characteristics of HHG.
    • The study offers insights into HHG in other asymmetric molecules like CO.