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Coherent Control of Molecular Orientation by a Terahertz Few-Cycle Laser Pulse

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Chinese Physics Letters 2013年第2期30卷 82-85页

作者： QIN Chao-Chao liu yu-Zhu ZHANG Xian-Zhou liu yu-fang Department of Physics Henan Normal UniversityXinxiang 453007 College of Physics and Opto-electronics Engineering Nanjing University of Information Science&TechnologyNanjing 210044

The coherent control of molecular orientation by a terahertz few-cycle laser pulse is theoretically *** is demonstrated that the field-free molecular orientation results from the interference contributions between the odd and even rotational wave packet,and therefore the constructive and destructive interferences lead to the observation of the positive and negative orientations,corresponding to the positive and negative ***,the enhancement or suppression of the molecular orientation can be coherently manipulated by precisely controlling the carrier-envelope phase of the terahertz few-cycle pulse.

关键词： coherent Pulse Molecular

Monitoring and Prediction of the Vibration Intensity of Seismic Waves Induced in Underwater Rock by Underwater Drilling and Blasting

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Defence Technology（防务技术） 2022年第1期18卷 109-118页

作者： Zhen-xiong Wang Wen-bin Gu Ting Liang Shou-tian Zhao Peng Chen liu-fang yu Research Institute of Chemical Defence 102205 China Armry Engineering University 210007China Archives Department of Space System100094China

All underwater drilling and blasting operations generate seismic ***,due to a lack of suitable vibration sensing instruments,most studies on the propagation of seismic waves have been limited to shorelines near construction areas or wharfs,whereas comparatively few studies have beerconducted on the larger seafloor *** address this gap,a seafloor vibration sensor system was developed and applied in this study that consists of an autonomous acquisition storage terminal,soft-ware platform,and hole-plugging device that was designed to record the blasting vibration intensities received through submarine rocks at a given measurement ***,dimensional analyses were used to derive a predictive equation for the strength of blast vibrations that considered the in fluence of the water *** combining reliable vibration data obtained using the sensor system in submarine rock and the developed predictive equation,it was determined that the water depth was ar important factor influencing the measured vibration *** results using the newly derivedequation were compared to those determined using the Sadowski equation,which is commonly used on land,and it was found that predictions using the derived equation were closer to the experimental values with an average error of less than 10%,representing a significant *** on these results the developed sensor system and preliminary theoretical basis was deemed suitable for studying the propagation behavior of submarine seismic waves generated by underwater drilling and blasting operations.

关键词： Seismic wave Underwater drilling and blasting Blasting vibration Dimensional analysis Induced seismicity

The Dynamics of Rubidium Atoms in THz Laser Fields

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Chinese Physics Letters 2013年第7期30卷 56-59页

作者： JIA Guang-Rui ZHAO yue-Jin ZHANG Xian-Zhou liu yu-fang yu Kun School of Optoelectronics Beijing Institute of TechnologyBeijing 100081 College of Physics and Information Engineering Henan Normal UniversityXinxiang 453007

By using B-spline basis set combined with model potential,energy levels and wave functions of rubidium atoms are *** a time-dependent multi-level approach,we study the dependence of the population of rubidium atoms excited from a low lying state to a target state on the parameters of a single or two broadband terahertz laser *** population redistribution between the states n=23 and n=24 due to the interaction with terahertz pulses is analyzed in *** oscillation in the initial and final states as a function of the time delay between two half cycle pulses is shown,and the oscillation period is the same as the Kepler period of the selected *** calculation results agree well with the experiment and can be explained by the semiclassical picture.

关键词： oscillation delay state

Population Evolution of Rydberg Rubidium Atoms by Half-Cycle Pulses

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Chinese Physics Letters 2012年第11期29卷 47-51页

Using the B-spline basis set method combined with model potential,the Stark energy level of rubidium atoms in the vicinity of n=30 is *** using a using time-dependent multilevel approach,we calculate the population redistribution of high Rydberg rubidium atoms under the interaction of external time-dependent half-cycle *** numerical results show that the population of rubidium atoms can be driven to lower or higher n levels with a train of half cycle pulses,the final population distribution of all the l states for the same n is observed after these interactions.

关键词： Rydberg spline cycle

Calculation of Multiphoton Transition in Li Atoms via Chirped Microwave Pulse

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Chinese Physics Letters 2011年第10期28卷 70-73页

作者： JIA Guang-Rui ZHANG Xian-Zhou liu yu-fang yu Kun ZHAO yue-Jin College of Physics and Information Engineering Henan Normal UniversityXinxiang 453007 School of Optoelectronics Beijing Institute of TechnologyBeijing 100081

The position and width of avoided crossings of Li atom energy levels in a static electric field is presented by using the B-spline basis set method combined with the model *** the time-dependent multilevel approach,the population of Li atoms is transferred to the target state completely by one-photon,two-photon or a single multiphoton adiabatic rapid passage,which requires only a small frequency *** calculation results agree well with the experiment and novel explanations are given to understand the experimental results.

关键词： potential photon Transition

A Modified Potential Method for Electrons Scattering Total Cross Section Calculations on Several Molecules at 30 ～ 5000 eV： CF4, CCl4, CFCl3, CF2Cl2, and CF3Cl

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Communications in Theoretical Physics 2006年第4期45卷 697-701页

作者： MA Heng SHI De-Heng SUN Jin-Feng liu yu-fang ZHU Zun-Lue Department of Physics Henan Normal University Xinxiang 453007 China Department of Foundation the First Aeronautical College of Air Force Xinyang 464000 China

A complex optical model potential modified by the concept of bonded atom, which takes into consideration the overlapping effect of electron clouds between two atoms in a molecule, is employed to calculate the total cross sections （TCS5） for electrons scattering from several molecules （CF4, CCl4, CFCl3, CF2 Cl2, and CF3 Cl） over an incident energy range 30 - 5000 eV using the additivity rule model at Hartre-Fock level. The quantitative TCS5 are compared with those obtained by experiments and other theories wherever available, and good agreement is obtained above 100 eV. It is shown that the modified potential can successfully calculate the TCS5 of electron-molecule scattering over a wide energy range, especially at lower energies.

关键词： total cross section additivity rule atomic and molecular collision

Elastic Scattering Properties of Ultracold Strontium Atoms

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Chinese Physics Letters 2011年第12期28卷 110-112页

作者： ZHANG Ji-Cai ZHU Zun-Lue liu yu-fang SUN Jin-Feng College of Physics and Information Engineering Henan Normal UniversityXinxiang 453007 Department of Physics Luoyang Normal CollegeLuoyang 471022

We investigate the elastic scattering properties of strontium atoms at ultracold *** scattering parameters,such as s-wave scattering lengths,effective ranges and p-wave scattering lengths,are calculated for all stable isotope combinations of Sr atoms by the quantal method and semiclassical method,*** agreements are *** scattering parameters are very sensitive to small changes of the reduced *** to the repulsive interisotope and intraisotope s-wave scattering length and large elastic cross sections,84Sr–86Sr mixture is a good candidate to realize Bose–Bose quantum degenerate atomic gases.

关键词： wave Elastic degenerate

S-Wave Scattering Properties for Na-K Cold Collisions

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Chinese Physics Letters 2013年第2期30卷 90-93页

作者： ZHANG Ji-Cai ZHU Zun-Lue SUN Jin-Feng liu yu-fang College of Physics and Electronic Engineering Henan Normal UniversityXinxiang 453007 Department of Physics Luoyang Normal CollegeLuoyang 471022

Scattering properties of ultracold atoms are sensitive to the interatomic *** on the accurate triplet least-bound state energy,we calculate the triplet s-wave scattering length for ^(23)Na-^(40)*** scattering length is-814.1^(+29)_(-31.3) a_(0) with a_(0) being the Bohr *** using the mass scaling method,those scattering lengths are also obtained for ^(23)Na-^(41)K and ^(23)Na-^(39)*** degenerate internal state approximation is used to estimate the scattering data of atoms colliding in different spin states.

关键词： potential. states. Scattering

Coherent Control of Molecular Alignment and Orientation by a Femtosecond Two-Color Laser Pulse

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Chinese Physics Letters 2013年第2期30卷 86-89页

作者： QIN Chao-Chao ZHAO Xing-Dong ZHANG Xian-Zhou liu yu-fang Department of Physics Henan Normal UniversityXinxiang 453007

The coherent control of molecular alignment and orientation by a femtosecond two-color laser pulse is studied *** effect of the carrier-envelope phase of the femtosecond two-color laser pulse on molecular alignment and orientation is discussed,and it is shown that the enhancement or suppression of the molecular orientation can be coherently manipulated by precisely controlling the carrier-envelope phase of the femtosecond two-color laser *** addition,the time-dependent angular distributions of the molecular axis are presented.

关键词： Femto coherent alignment