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Influence of Femtosecond Laser Parameters on Autler-Townes Splitting of Three-Level Ladder Molecules
Yue-hua Lia,Xing-qiang Lub,Wei Guoa*,Hong-bin Yaoc
Author NameAffiliationE-mail
Yue-hua Lia School of Electrical Engineering, University of South China, Hengyang 421001, China  
Xing-qiang Lub School of Nuclear Science and Technology, University of South China, Hengyang 421001, China  
Wei Guoa* School of Electrical Engineering, University of South China, Hengyang 421001, China vella99@163.com 
Hong-bin Yaoc 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a,路兴强b,郭玮a*,姚洪斌c
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
分类号: