研究目的
Investigating the odd–even harmonics generation from oriented CO molecules in linearly polarized laser fields and the influence of the dynamic core-electron polarization.
研究成果
The study confirms the pure odd and pure even harmonic spectra from CO molecules at specific orientations, attributing the behavior to the half-cycle mirror symmetry of the molecule–field system. The dynamic core-electron polarization affects only the odd harmonics, and the symmetry-breaking at other orientations results in both odd and even harmonics.
研究不足
The study is theoretical and relies on numerical simulations. The influence of dynamic core-electron polarization is only noticeable for odd harmonics, and the study is limited to CO molecules.
1：Experimental Design and Method Selection:
The study employs the time-dependent Schro¨dinger equation within the single-active-electron approximation to simulate the interaction of CO molecules with linearly polarized laser fields.
2：Sample Selection and Data Sources:
The CO molecule is modeled as one active electron moving in an effective potential.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned.
4：Experimental Procedures and Operational Workflow:
The wave function is computed by expanding it in terms of eigenfunctions of the field-free Hamiltonian, using the B-spline basis set associated with the Legendre polynomials. The time evolution is calculated by the fourth-order Runge–Kutta method.
5：Data Analysis Methods:
The HHG spectra are obtained from the induced dipole acceleration by Fourier transforming it into the frequency domain.
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