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Chin. Phys. B, 2021, Vol. 30(11): 114213    DOI: 10.1088/1674-1056/abfbd9
Special Issue: SPECIAL TOPIC — Optical field manipulation
SPECIAL TOPIC—Optical field manipulation Prev   Next  

Minimum structure of high-harmonic spectrafrom aligned O2 and N2 molecules

Bo Yan(闫博)1, Yi-Chen Wang(王一琛)1, Qing-Hua Gao(高庆华)1, Fang-Jing Cheng(程方晶)1, Qiu-Shuang Jing(景秋霜)1, Hong-Jing Liang(梁红静)1,2,†, and Ri Ma(马日)1,‡
1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 College of Science, Jilin Institute of Chemical Technology, Jilin 132022, China
Abstract  We experimentally investigated the high-order harmonic generation (HHG) from aligned O2 and N2 molecules in a linearly polarized laser field, and presented the dependence of the harmonic spectrum on the driving laser intensity and molecular alignment angle. The minimum position of HHG of O2 varies with changing the laser intensity, which is caused by multi-orbital interference. However, the location of the observed minimum structure in N2 harmonic spectrum remained unchanged upon changing the laser intensity. The mechanism of the spectral minimum for N2 case is regarded as a Cooper-like minimum in HHG associated with the molecular electronic structure. This work indicates that harmonic spectroscopy can effectively uncover information about molecular structure and electron dynamics.
Keywords:  high-order harmonic generation      aligned molecule      multi-orbital interference of molecules      Cooper-like minimum  
Received:  08 February 2021      Revised:  02 April 2021      Accepted manuscript online:  27 April 2021
PACS:  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  33.20.Xx (Spectra induced by strong-field or attosecond laser irradiation)  
  33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307700), the National Natural Science Foundation of China (Grant Nos. 91750104 and 11974137), and the Natural Science Foundation of Jilin Province, China (Grant No. YDZJ202101ZYTS157).
Corresponding Authors:  Hong-Jing Liang, Ri Ma     E-mail:;

Cite this article: 

Bo Yan(闫博), Yi-Chen Wang(王一琛), Qing-Hua Gao(高庆华), Fang-Jing Cheng(程方晶), Qiu-Shuang Jing(景秋霜), Hong-Jing Liang(梁红静), and Ri Ma(马日) Minimum structure of high-harmonic spectrafrom aligned O2 and N2 molecules 2021 Chin. Phys. B 30 114213

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