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Influence of Femtosecond Laser Parameters on Autler-Townes Splitting of Three-Level Ladder Molecules
Yue-hua Li1, Xing-qiang Lu2, Wei Guo1, Hong-bin Yao3
1.School of Electrical Engineering, University of South China, Hengyang 421001, China;2.School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;3.State Key Laboratory of Molecule Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
Abstract:
We theoretically investigate the Autler-Townes (AT) splitting in the photoelectron spectra of three-level ladder K2 molecule driven by a pump-probe pulse via employing the timedependent wave packet approach. The dependence of AT splitting on two laser intensities and wavelengths are studied in detail. We firstly quantify these effects on peak shift and AT separation. The photoelectron spectra show double splitting with symmetric profiles, but with asymmetric profiles when the wavelength is changed. The magnitude of AT splitting increases with the pump laser intensity, but does not vary with probe intensity. The shifts of the absorption peaks and the splitting between AT doublet are predicted by using an analytical fitting function when the intensity/wavelength of one of the two fields is changed. These novel results are of importance for the molecular spectroscopy and may further stimulate the first principles theoretical studies analytically.
Key words:  Autler-Townes splitting  Photoelectron spectra  Three-level ladder K2 molecule
FundProject:
飞秒激光参数对三态阶跃型分子Autler-Townes分裂的影响
李月华1, 路兴强2, 郭玮1, 姚洪斌3
1.华大学电气工程学院,衡阳 421001;2.南华大学核科学技术学院,衡阳 421001;3.中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连 116023
摘要:
利用三态模型和含时波包法, 研究了K2分子在强飞秒泵浦-探测激光场中泵浦/探测场强、波长对光电子能谱Autler-Townes(AT)分裂的影响.通过分别改变两激光场的场强或者波长预测AT峰移和间距,并且首次量化了AT分裂的峰移和间距.光电子能谱在共振时显示为对称双峰,失谐时为非对称双峰。AT分裂间距随泵浦场强增大而增大,但不因探测场强改变而改变.
关键词:  Autler-Townes分裂  光电子能谱  三态阶跃型K2分子
DOI:10.1063/1674-0068/28/cjcp1501006
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