The low-order harmonic generation of hydrogen molecular ion interacting with a linearly polarized laser field has been investigated theoretically by using a simple two-state model. The validity of the two-state model is carefully examined by comparing the harmonic spectra of hydrogen molecular ion obtained from this model with those from the three-dimensional time-dependent Schrödinger equation. When combined with the Morlet transform of quantum time-frequency spectrum, the two-state model can be used to study the dynamical origin of the low-order harmonic generation of hydrogen molecular ion driven by low-frequency pulses. In addition, some interesting structures of the time profiles for low order harmonics are obtained.

Project supported by the National Natural Science Foundation of China (Grant Nos. 11465016, 11674268, and 11764038).

Corresponding Authors:
Ling-Ling Du, Xiao-Xin Zhou
E-mail: dull2014@163.com;zhouxx@nwnu.edu.cn

Cite this article:

Ling-Ling Du(杜玲玲), Guo-Li Wang(王国利), Peng-Cheng Li(李鹏程), Xiao-Xin Zhou(周效信) Low-order harmonic generation of hydrogen molecular ion in laser field studied by the two-state model 2018 Chin. Phys. B 27 113201

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