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Laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr
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作者 鲁振中 陈德应 +1 位作者 樊荣伟 夏元钦 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第6期202-206,共5页
By considering the relative velocity distribution function and multipole expansion interaction Hamiltonian, a three-state model for calculating the cross section of laser-induced quadrupole-quadrupole collisional ener... By considering the relative velocity distribution function and multipole expansion interaction Hamiltonian, a three-state model for calculating the cross section of laser-induced quadrupole-quadrupole collisional energy transfer is presented. Calculated results in Xe-Kr system show that in the present system, the laser-induced collision process occurs for -4 ps, which is much shorter than the dipole-dipole laser-induced collisional energy transfer (LICET) process. The spectrum of laser-induced quadrupole quadrupole collisional energy transfer in Xe-Kr system has wider tunable range in an order of magnitude than the dipole-dipole LICET spectra. The peak cross section decreases and moves to the quasi-static wing with increasing temperature and the full width at half peak of the profile becomes larger as the system temperature increases. 展开更多
关键词 laser-induced collisional energy transfer collisional cross section Xe-Kr system
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Laser-induced collisional energy transfer in Sr-Li system
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作者 陈德应 鲁振中 +3 位作者 樊荣伟 夏元钦 周志刚 季一勤 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第8期167-172,共6页
A four-state model considering the relative velocity distribution function for calculating the cross section of laserinduced collisional energy transfer in a Sr Li system is presented and profiles of laser-induced col... A four-state model considering the relative velocity distribution function for calculating the cross section of laserinduced collisional energy transfer in a Sr Li system is presented and profiles of laser-induced collision cross section are obtained. The resulting spectra obtained from different intermediate states are strongly asymmetrical in an opposite asymmetry. Both of the two intermediate states have contributions to the final state, and none of the intermediate states should be neglected. The peak of the laser-induced collisional energy transfer (LICET) profile shifts toward the red and the FWHM becomes narrower obviously with laser field intensity increasing. A cross section of 1.2 × 10^-12 cm2 at a laser field intensity of 2.17 ×107 V/m is obtained, which indicates that this collision process can be an effective way to transfer energy selectively from a storage state to a target state. The existence of saturation for cross section with the increase of the laser intensity shows that the high-intensity redistribution of transition probabilities is an important feature of this process, which is not accounted for in a two-state treatment. 展开更多
关键词 laser-induced collisional energy transfer collision cross section Sr-Li system
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Four-level model of ion-ion laser-induced collisional energy transfer and numerical calculations for Ca^+-Sr^+ system
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作者 陈德应 张洪英 樊荣伟 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第5期233-240,共8页
The four-level model of laser-induced collisional energy transfer (LICET) for the ion-ion collision system is established based on the time-dependent SchrSdinger equation for the electron dynamics, through which the... The four-level model of laser-induced collisional energy transfer (LICET) for the ion-ion collision system is established based on the time-dependent SchrSdinger equation for the electron dynamics, through which the equations of motion of the probability amplitudes and cross section of the collision system are obtained. Numerical calculations are performed for the Ca+ Sr+ system, with the results showing that the peak of the LICET spectrum appears at a resonant frequency of the transfer laser. The magnitude of the obtained collision cross section is in the order of 10-16 cm2, and is comparable to that obtained in atomic systems, which indicates the validity of the established four-level model. 展开更多
关键词 laser-induced collisional energy transfer four-level model Ca+-Sr+ system
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Calculation of laser induced collisional energy transfer in the Sr-Ca system
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作者 LU ZhenZhong1,2,CHEN DeYing1,2,FAN RongWei1,2 & XIA YuanQin1,2 1 National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150080,China 2 Institute of Opto-electronics,Harbin Institute of Technology,Harbin 150080,China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第2期256-261,共6页
Based on the four-state model of laser-induced collisional energy transfer,the cross section of the collisional energy transfer in the Sr-Ca system is obtained.Various factors,including field intensity,relative speed,... Based on the four-state model of laser-induced collisional energy transfer,the cross section of the collisional energy transfer in the Sr-Ca system is obtained.Various factors,including field intensity,relative speed,and temperature,which influence the collisional cross section,are discussed for illustrating the features of the Sr-Ca laser-induced collisional energy transfer(LICET) process.The calculated results show that the LICET spectral profiles obviously become narrower when the laser field intensity increases.The collision cross section rises with laser intensity and tends to saturate.In the vicinity of the spectral profile center,the cross section at fixed laser detuning becomes smaller as the relative speed and system temperature increase.The results indicate that the intermediate states strongly affect the spectral profile of LICET. 展开更多
关键词 laser-induced collisional energy transfer collision cross section Sr-Ca system
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Numerical study of laser-induced collision process in Eu-Sr in strong field
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作者 ZHANG Hongying XlAYuanqin +3 位作者 CHEN Deying XIAO Pan FAN Rongwei MA Zuguang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2005年第1期78-88,共11页
Theoretically based on the four-level model,one LICET process in Eu-Sr system in both weak and strong fields was calculated by immediate numerical integrations.Numerical results in weak field are in fair to good agree... Theoretically based on the four-level model,one LICET process in Eu-Sr system in both weak and strong fields was calculated by immediate numerical integrations.Numerical results in weak field are in fair to good agreement with analytical ones.Numerical results in strong field show that:(a)the peak of the LICET profiles moves to the violet side and the tuning range of the profiles obviously becomes narrower when the laser field intensity increases;and(b)numerical results in strong field differ a lot from analytical ones,which indicates that in strong field,the analytical expressions are not applicable any longer. 展开更多
关键词 laser-induced collisional energy transfer(licet) tuning range cross section strong field effect.
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Numerical study of laser-induced inelastic collisions in Cs-Sr
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作者 陈德应 王骐 +1 位作者 夏元钦 马祖光 《Science China Mathematics》 SCIE 2000年第6期638-646,共9页
Two LICET transitions in Cs-Sr systems are suggested and the results of numerical calculations of the transition probability and collisional crosssection are obtained respectively from our four-level model and the con... Two LICET transitions in Cs-Sr systems are suggested and the results of numerical calculations of the transition probability and collisional crosssection are obtained respectively from our four-level model and the conventional three-level model. Comparisons of these results prove the theoretical prediction that if the frequency difference ω21, is comparable to ω43, the three-level theory has great error in describing the LICET transition, while the four-level theory can describe all cases of LICET process perfectly. 展开更多
关键词 ATOM laser-induced collisional energy transfer (licet) collisional crosssection.
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