Contributions of the Two Nuclei to the Harmonic Generation in H⁺₂ Molecules

The separate contributions of the two nuclei in H⁺₂ to the harmonic generation are investigated by numerically solving the time-dependent Schr?dinger equation. The results show that the diverse electron distributions around the two nuclei under the effect of a laser field lead to different contributions of the two nuclei to the harmonic generation in different times, i.e., the contribution mainly comes from nucleus A around the (n+0.5) optical cycle while from nucleus B around the n optical cycle. By means of the time-frequency distributions and the coupled electron nuclear wave-packet density distributions, the physical mechanism is discussed in detail.