Theoretical study of the odd–even-order harmonic generation for asymmetric ions in non-Born–Oppenheimer approximation
Yue Sheng-Jun1, 2, Du Hong-Chuan1, 2, †, Wu Hong-Mei1, 2, Xue Shan1, 2, Zhao Jia-Chen1, 2, Hu Bi-Tao1, 2, ‡
       

Harmonic spectra generated from (a) H, (b) HD, and (c) HeH by a laser with the peak intensity of 4 × 10 W/cm and the wavelength of 770 nm. The corresponding 3D simulation results are shown in the right column. The insets are the enlarged area of the harmonic spectra from 40th to 50th order.