中国物理B ›› 2015, Vol. 24 ›› Issue (1): 13302-013302.doi: 10.1088/1674-1056/24/1/013302

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Effect of pump-1 laser on Autler–Townes splitting in photoelectron spectrum of K2 molecule

郭玮a, 路兴强b, 王新林a, 姚洪斌c   

  1. a School of Electric Engineering, University of South China, Hengyang 421001, China;
    b School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;
    c Department of Basic Courses, Xinjiang Institute of Engineering, Urumqi 830091, China
  • 收稿日期:2014-07-30 修回日期:2014-09-12 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 41104094 and 11174119), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20114324120002), the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 12C0370), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars.

Effect of pump-1 laser on Autler–Townes splitting in photoelectron spectrum of K2 molecule

Guo Wei (郭玮)a, Lu Xing-Qiang (路兴强)b, Wang Xin-Lin (王新林)a, Yao Hong-Bin (姚洪斌)c   

  1. a School of Electric Engineering, University of South China, Hengyang 421001, China;
    b School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;
    c Department of Basic Courses, Xinjiang Institute of Engineering, Urumqi 830091, China
  • Received:2014-07-30 Revised:2014-09-12 Online:2015-01-05 Published:2015-01-05
  • Contact: Lu Xing-Qiang E-mail:luxingqiang@163.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 41104094 and 11174119), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20114324120002), the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 12C0370), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars.

摘要:

We theoretically investigate the Autler-Townes (AT) splitting in the photoelectron spectrum of four-level ladder K2 molecule driven by a pump 1-pump 2-probe pulse via employing the time-dependent wave packet approach. The effects of the pump-1 laser intensity and wavelength on AT splitting are studied for the first time. The magnitude of AT splitting increases with increasing the pump-1 laser intensity. The triple splitting with asymmetric profile occurs due to the nonresonant excitation. The triple structure is transformed into a double structure (near-resonant region), and then becomes a peak (far-off resonant region) progressively as the pump-1 laser is detuned from the resonance wavelength, which can be explained in terms of the asymmetric excitation/population of dressed states. The splitting between adjacent peaks and the splitting between the two sideband peaks in the triplet do not change with the pump-1 pulse wavelength. The three peaks shift toward lower energy with the same shift 1/4*Δ1 as the pump-1 wavelength changes in near-resonant region. The asymptotic behaviors of AT splitting with the pump-1 laser intensity are interesting in the threshold points of the near-resonant region and the far-off resonant region.

关键词: Autler-Townes splitting, photoelectron spectra, four-level ladder K2 molecule

Abstract:

We theoretically investigate the Autler-Townes (AT) splitting in the photoelectron spectrum of four-level ladder K2 molecule driven by a pump 1-pump 2-probe pulse via employing the time-dependent wave packet approach. The effects of the pump-1 laser intensity and wavelength on AT splitting are studied for the first time. The magnitude of AT splitting increases with increasing the pump-1 laser intensity. The triple splitting with asymmetric profile occurs due to the nonresonant excitation. The triple structure is transformed into a double structure (near-resonant region), and then becomes a peak (far-off resonant region) progressively as the pump-1 laser is detuned from the resonance wavelength, which can be explained in terms of the asymmetric excitation/population of dressed states. The splitting between adjacent peaks and the splitting between the two sideband peaks in the triplet do not change with the pump-1 pulse wavelength. The three peaks shift toward lower energy with the same shift 1/4*Δ1 as the pump-1 wavelength changes in near-resonant region. The asymptotic behaviors of AT splitting with the pump-1 laser intensity are interesting in the threshold points of the near-resonant region and the far-off resonant region.

Key words: Autler-Townes splitting, photoelectron spectra, four-level ladder K2 molecule

中图分类号:  (Photoelectron spectra )

  • 33.60.+q
33.20.Xx (Spectra induced by strong-field or attosecond laser irradiation) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)