title: Reexamining the high-order harmonic generation of HD molecule in non-Born-Oppenheimer approximation.
abstract: The high-order harmonic generation of the HD molecule is studied in non-Born-Oppenheimer approximation. It is found that there are only the odd harmonics in the harmonic spectrum of the HD molecule though the generation of even harmonics is possible in principle. Theoretical analysis [T. Kreibich et al., Phys. Rev. Lett. 87, 103901 (2001)] reveals that the nuclear dipole moment can contribute to the generation of the even harmonics, but the acceleration of the nucleus is about three orders of magnitude less than that of the electron. Hence, the even harmonics cannot be observed in the harmonic spectrum of the HD molecule.
authors.affiliation: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Hongchuan
authors.initials: H
authors.lastname: Du
authors.affiliation: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Shengjun
authors.initials: S
authors.lastname: Yue
authors.affiliation: Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
authors.forename: Huiqiao
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Wu
authors.affiliation: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Bitao
authors.initials: B
authors.lastname: Hu