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Coherent emission and attosecond transient absorption of N_(2)^(+) in strong fields

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 2-7页

作者： Qian Zhang Guangru Bai Bin Zhang Jinlei Liu Hongbin Lei Xiaowei Wang Jing Zhao Zengxiu Zhao Institute of Brain-Inspired Intelligence Nanjing UniversityNanjing 210093China School of Physics Nanjing University of Science and TechnologyNanjing 210094China

The ionic dynamics induced by strong-field ionization are essential to understand the fundamental physics and chemical *** solving the ionization-coupling equation theoretically,we can simultaneously address strong-field ionization and coupling dynamics in *** employing the driving pulse at the wavelength of 1580 nm,we show that the B^(2)Σ_(u)^(+) state of the strong field ionization created N_(2)^(+) could be populated by polarization effect and five-photon resonance but there is no population inversion between X^(2)Σ_(g)^(+) and B^(2)Σ_(u)^(+) states for the nitrogen molecular ions aligning along the laser *** addition,both the ultraviolet supercontinuum and the attosecond transient absorption spectroscopy(ATAS)are calculated to illustrate the characteristics of population and *** Stark shift observed from the transient absorption confirms the origin of ultraviolet *** results show the evolution of the absorption spectral lineshape,varying from Lorentzian to Fano to inverted Lorentzian and back forth and the optical gain is achieved at 394 e V due to the vibrational coherent *** study offers valuable insights into the strong-field quantum optics of molecular ions.

关键词： vibrational analysis ultraviolet spectra X-ray spectra

Selective excitation of molecular mode in a mixture by femtosecond resonance-enhanced coherent anti-Stokes Raman scattering spectroscopy

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Chinese Physics B 2012年第2期21卷 526-530页

作者： He Ping Li Si-Ning Fan Rong-Wei Li Xiao-Hui Xia Yuan-Qin Yu Xin Chen De-Ying National Key Laboratory of Science and Technology on Tunable Laser Institute of Opto-electronicsHarbin Insitute of TechnologyHarbin 150080China College of Foundation Science Harbin University of CommerceHarbin 150028China

Femtosecond time-resolved coherent anti-Stokes Raman scattering （CARS） spectroscopy is used to investigate gaseous molecular dynamics. Due to the spectrally broad laser pulses, usually poorly resolved spectra result from this broad spectroscopy. However, it can be demonstrated that by the electronic resonance enhancement optimization control a selective excitation of specific vibrational mode is possible. Using an electronically resonance-enhanced effect, iodine molecule specific CARS spectroscopy can be obtained from a mixture of iodine-air at room temperature and a pressure of 1 atm （corresponding to a saturation iodine vapour as low as about 35 Pa）. The dynamics on either the electronically excited state or the ground state of iodine molecules obtained is consistent with previous studies （vacuum, heated and pure iodine） in the femtoseeond time resolved CARS spectroscopy, showing that an effective method of suppressing the non-resonant CARS background and other interferences is demonstrated.

关键词： ultrafast spectroscopy coherent anti-Stokes Raman scattering vibrational analysis resonance enhancement

Dynamical entanglement for Fermi coupled stretching and bending modes

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Chinese Physics B 2009年第7期18卷 2719-2723页

作者：侯喜文成传明 Department of Physics Huazhong Normal University Department of Physics and Electronic Engineering Yunyang Teachers' College

The dynamical entanglement for Fermi coupled C-H stretch and bend vibrations in molecule CHD3 is studied in terms of two negativities and the reduced yon Neumann entropy, where initial states are taken to be direct products of photon-added coherent states on each mode. It is demonstrated that the negativity defined by the sum of negative eigenvalues of the partial transpose of density matrices is positively correlated with the von Neumann entropy. The entanglement difference between photon-added coherent states and usual coherent states is discussed as well.

关键词： vibrational analysis quantum entanglement

Artificial Monitoring of Eccentric Synchronous Reluctance Motors Using Neural Networks

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Computers, Materials & Continua 2022年第7期72卷 1035-1052页

作者： Shuguang Wei Jiaqi Li Zixu Zhao Dong Yuan Army Academy of Armored Forces Beijing100072China

This paper proposes an artificial neural network for monitoring and detecting the eccentric error of synchronous reluctance ***,a 15 kWsynchronous reluctance motor is introduced and took as a case study to investigate the effects of eccentric ***,the equivalent magnetic circuits of the studied motor are analyzed and developed,in cases of dynamic eccentric rotor and static eccentric rotor condition,*** that,the analytical equations of the studied motor are derived,in terms of its air-gap flux density,electromagnetic torque,and electromagnetic force,followed by the electromagnetic finite element ***,the modal analyses of the stator and the whole motor are performed,respectively,to explore the natural frequency and the modal shape of the motor,by which the further vibrational analysis is possible to be *** vibration level of the housing is furtherly studied to investigate its relationship with the rotor eccentricity,which is validated by the prototype ***,an artificial neural network,which has 3 layers,is *** taking the air-gap flux density,the electromagnetic force,and the vibrational level as inputs,and taking the eccentric distance as output,the proposed neural network is trained till the error smaller than 5%.Therefore,this neural network is obtaining the input parameters of the tested motor,based on which it is automatically monitoring and reporting the eccentric error to the upper-level control center.

关键词： Synchronous reluctance motor rotor eccentricity vibrational analysis artificial neural network

Fermi Resonances and vibrational Spectrum of a Polyatomic Molecule XY4： an Algebraic Approach

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Communications in Theoretical Physics 2005年第5期43卷 891-894页

作者： WANMing-Fang CHENJing-Hua HOUXi-Wen SchoolofNaturalScience WuhanUniversityofTechnologyWuhan430079China DepartmentofInformationManagement HuazhongNormalUniversityWuhan430079China DepartmentofPhysics HuazhongNormalUniversityWuhan430079China

A U(2) algebraic model is introduced for the spectrum of a molecule XY4, where the interactions between the stretch and bend modes are described by Td symmetric Fermi resonance terms. The presented algebraic model in a limit corresponds to another model in recent literature. The vibrational spectrum of methane (CH4) measured recently with modern spectroscopy techniques is employed to test those models. The obtained standard deviation between the observed and the calculated vibrational energy levels in the algebraic model is smaller than that in the corresponding model.

关键词： vibrational analysis algebraic method

Reaction Mechanism of the Multi-channel Decomposition Reactions of C_(10)H_(14)^+·

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Chinese Journal of Structural Chemistry 2009年第3期28卷 370-376页

作者：程学礼赵燕云李丽清丁静李峰 Department of Chemistry Taishan University College of Chemistry and Chemical Engineering Taishan Medical University Department of Physics Taishan University

n-Butylbenzene cations C10H14^＋ serve as a model compound to investigate the reaction mechanisms of alkylbenzene cations. The reactions of C10H14^＋. decomposition reaction system have been studied extensively at the B3LYP/6-311＋＋G^＊＊ level with Gaussion98 package. The chain reaction of C10H14^＋ dissociation was initiated by C-H bond rupture. All reaction channels initiated by C-H rupture were fully investigated with the vibrational mode analvsis to confirm the transition states and to reveal the reaction mechanism. A theoretical investigation on the reactions of this positive ion free radical can help us fully understand the decomposition processes.

关键词： reaction mechanism C10H14^+ vibrational analysis

vibrational Spectroscopic Study of N-[4-[1-Hydroxy-2-[(1-Methyl Ethyl)Amino]Ethyl]Phenyl]Methane Sulfonamide

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光谱学与光谱分析 2016年第3期36卷 880-886页

作者： N.Balamurugan S.Sampathkrishnan C.Charanya Department of Physics Sri Lakshmi Ammaal Engineering College Department of Physics Sri Venkateswara College of Engineering Research Scholar Department of PhysicsSri Venkateshwara College of Engineering

The vibrational spectral analysis was carried out by using FT-Raman and FT-IR spectroscopy in the range 4 000~400and 4 000~400cm-1 respectively,for N-[4-[1-hydroxy-2-[(1-methyl ethyl)amino]ethyl]phenyl]methane sulfonamide(HPAEPMS)*** calculations were performed by ab initio Density Functional Theory(DFT)method using 6-31G(d,p)basis *** complete vibrational assignments of wavenumbers were made on the basis of potential energy distribution(PED).The results of the calculations were applied to simulated spectra of the title compound,which show excellent agreement.

关键词： FT-IR FT-Raman DFT vibrational analysis

Fidelity and Mutual Entropy in Mixed States for Fermi-resonance Coupling Vibrations of CS2

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Chinese Journal of Chemical Physics 2010年第4期23卷 393-396,I0001页

作者：彭东平侯喜文华中师范大学物理系武汉430079

The dynamics of four fidelities is studied for mixed coherent states and mixed squeezed states of Fermi-resonance coupling vibrations in molecule CS2. It is demonstrated that those fidelities are dominant-positively correlated with each other, one of which by Wang et al. （Phys. Lett. A 373, 58 （2008）） is the most striking in dominant anti-correlation with quantum mutual entropy. That is useful for molecular quantum computing and quantum information.

关键词： Fidelity Quantum mutual entropy vibrational analysis

Shape Control and Vibration analysis of Pi-ezolaminated Plates Subjected to Electro-Mechanical Loading

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Open Journal of Civil Engineering 2016年第3期6卷 335-345页

作者： Rajan L. Wankhade Kamal M. Bajoria Applied Mechanics Department Government College of Engineering Karad India Department of Civil Engineering Indian Institute of Technology Bombay Mumbai India

Shape control and free vibration analysis of piezolaminated plates subjected to electro mechanical loading are evaluated using finite element method. First order shear deformation theory is employed in the analysis. Both extensions as well as shear actuators are considered for piezolaminated plates. Rectangular four node isoparametric element is used in the finite element formulation. Variation of temperature is neglected for the orthotropic layers of the laminate and for piezolayer. Annular circular plates and rectangular plates with piezoelectric layers mounted and/or integrated are analysed for various parameters. Numerical results are presented for varying the actuator voltage for annular plates with different thicknesses of piezo patches. In case of rectangular plate shear actuator is considered for vibration analysis.

关键词： Piezoelectric Material Finite Element analysis Shape control vibrational analysis