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Efficient solver for time-dependent Schr?dinger equation with interaction between atoms and strong laser field

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Chinese Physics B 2019年第8期28卷 70-76页

作者：周胜鹏刘爱华刘芳王春成丁大军 Institute of Atomic and molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy (Jilin University) School of Mathematics and Statistics Changchun University of Technology

We present a parallel numerical method of simulating the interaction of atoms with a strong laser field by solving the time-depending Schr?dinger equation(TDSE) in spherical coordinates. This method is realized by combining constructing block diagonal matrices through using the real space product formula(RSPF) with splitting out diagonal sub-matrices for short iterative Lanczos(SIL) propagator. The numerical implementation of the solver guarantees efficient parallel computing for the simulation of real physical problems such as high harmonic generation(HHG) in these interaction systems.

关键词： time-dependent Schr?dinger equation Strong laser fields Parallel numerical solver

Two types of highly efficient electrostatic traps for single loading or multi-loading of polar molecules

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Chinese Physics B 2020年第4期29卷 284-291页

作者： Bin Wei Hengjiao Guo Yabing Ji Shunyong Hou Jianping Yin State Key Laboratory of Precision spectroscopy East China Normal UniversityShanghai 200062China

Two novel electrostatic traps named octopole-based disk electrostatic trap(ODET)and tubular-based disk electrostatic trap(TDET)are proposed for trapping cold polar molecules in low-field-seeking *** MgF as the target molecule,single loading and multi-loading methods are numerically simulated with varied incident velocities of slow molecular beams in the two types of traps,*** ODET,with an incident velocity of 10 m/s,a highest loading efficiency of 78.4% or 99.9% has been achieved under the single loading or multi-loading operation *** TDET,with an incident velocity of 11 m/s,a highest loading efficiency of 81.6% or 106.5% has been achieved using the two loading methods,*** such high loading efficiencies,the trapped cold molecules can be applied in the researches of cold collisions,high precision spectroscopy,and precision ***,together with a blue-detuned hollow beam,the new electrostatic traps proposed here offer a new platform for the following gradient-intensity cooling of MgF molecules,which may provide a new way to produce high density ultracold molecules.

关键词： cold molecules electrostatic trapping Monte Carlo simulations

An ultra-sensitive dual-mode imaging system using metal-enhanced fluorescence in solid phantoms

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Nano Research 2015年第12期8卷 3912-3921页

作者： Eran A. Barnoy Dror Fixler Rachela Popovtzer Tsviya Nayhoz Krishanu Ray Faculty of Engineering and the Institute of Nanotechnology and Advanced Materials Bar Ilan University Ramat Gan 5290002 Israel Center for Fluorescence spectroscopy Department of Biochemistry and Molecular Biology University of Maryland School of Medicine Baltimore MD 21201 USA

In this study, we developed a highly sensitive dual-mode imaging system using gold nanoparticles （GNPs） conjugated to various fluorophores in solid phantoms. The system consists of fluorescence-lifetime imaging microscopy （FLIM） for surface imaging, diffusion reflection （DR） for deep-tissue imaging （up to 1 cm）, and metal-enhanced fluorescence （MEF）. We detected quenching in the fluorescent intensity （FI） for the conjugation of both gold nanospheres （GNS） and gold nanorods （GNRs） to Fluorescein, which has an excitation peak at a wavelength shorter than the surface plasmon resonance （SPR） of both types of GNPs. Enhanced FI was detected in conjugation to Rhodamine B （RhB） and Sulforhodamine B （SRB）, both with excitation peaks in the SPR regions of the GNPs. The enhanced FI was detected both in solution and in solid phantoms by the FLIM measurements. DR measurements detected the presence of GNRs within the solid phantoms by recording the dropped rates of light scattering in wavelengths corresponding to the absorption spectra of the GNRs. With the inclusion of MEF, this promising dual-mode imaging technique enables efficient and sensitive molecular and functional imaging.

关键词： gold nanoparticles biomolecular imaging noninvasive detection diffusion reflection fluorescence lifetimeimaging metal-enhanced fluorescence

Coherent control of non-resonant two-photon transition in molecular system

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Chinese Physics B 2010年第11期19卷 307-310页

作者：张晖张诗按王祖赓孙真荣 State Key Laboratory of Precision spectroscopy and Department of PhysicsEast China Normal University

In this paper, we study theoretically and experimentally the coherent control of non-resonant two-photon transition in a molecular system （Perylene dissolved in chloroform solution） by shaping the femtosecond pulses with simple phase patterns （cosinusoidal and π phase step-function shape）. The control efficiency of the two-photon transition probability is correlated with both the laser field and the molecular absorption bandwidth. Our results demonstrate that, the two-photon transition probability in a molecular system can be reduced but not completely eliminated by manipulating the laser field, and the control efficiency is minimal when the molecular absorption bandwidth is larger than twice the laser spectral bandwidth.

关键词： two-photon transition coherent control pulse shaping

Observation of the Hyperfine structure of the 2^(3)∏_(1g) State in Na2

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Chinese Physics Letters 2001年第10期18卷 1341-1343页

作者： WANG Wei-Sheng SHANG Jian-Yuan Sun Zhen-Rong WANG ZU-GENG Key Laboratory for Optical and Magnetic Resonance spectroscopy and Department of PhysicsEast China Normal UniversityShanghai 200062 Department of Electronic Puzhou UniversityPuzhou 350002 Department of Physics and Center of Atomic and molecular Sciences Tsinghua UniversityBeijing 100084

We report the results of the hyperfine structure (HFS) of the 2^(3)∏_(1g) state in Na_(2). The relative ultraviolet and visible fluorescence spectra of molecular sodium were measured by means of a Doppler-free two-photon spectroscopy technique. The HFS of the 23Hg(v = 78, J = 37,Ω = 1) level was first observed and its HFS constant was measured to be C = -4.92 ± 0.26 MHz. The intermediate enhancing and upper energy levels were labelled by the experimental and theoretical methods.

关键词： technique. methods. ultraviolet

Alternating deposition films of a polymer and dendrimers bearing diphenylanthracene

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Chinese Science Bulletin 2005年第3期50卷 208-212页

作者： SUN Jing WANG Liyan GAO Jian YU Xi WANG Zhiqiang Key Laboratory of Supramolecular structure and Materials Jilin University Changchun 130012 China Key Laboratory of Organic Optoelectronics and molecular Engineering Tsinghua University Bejjng 100084. China

Two generations of carboxyl-terminated poly (aryl ether) dendrimers bearing 9,10-diphenylanthracene cores are designed and synthesized. Alternating deposition of two dendrimers and poly(4-vinylpyridine) is studied with UV-Vis spectroscopy, FT-IR spectroscopy and atomic force microscopy. Experimental results indicate that this method to introduce chromophore into multilayer film can effectively prevent desorption of dye molecule. Moreover, it is found that dendrimer can inhibit the aggregation of fluorophore in film using fluorescence spectroscopy. Increase of dendrimer’s generation can enhance fluorescence intensity of each fluorophore. This provides a new approach to design lumi- nescent thin film.

关键词：交互沉积薄膜聚合物联苯蒽模树石化学结构

A Precise Description of the Electronic structures and Spin-Allowed Transition Properties of PF and Its Cation:All-Electron Configuration-Interaction Investigations Including Relativistic Effect

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Chinese Physics Letters 2015年第7期32卷 42-46页

作者：李奇楠赵书涛张晓美罗旺李瑞闫冰 Department of Physics College of Science Qiqihar University Qiqihar 161006 School of Physics and Electronic Science Fuyang Normal College Nuyang 236037 Institute of Atomic and molecular Physics Jilin University Changchun 130012 Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy Jilin University Changchun 130012

The electronic structures of PF and PF＋ are calculated with the high-level configuration interaction method. To improve the precision of calculations, the spin-orbit coupling effect, the scalar relativistic effect, and the Davidson correction（q-Q） are also considered. The spectroscopic parameters of bound states are derived by the electronic structures of PF and PF＋, which are in good accordance with the measurements. The transition dipole moments of spin-allowed transitions are evaluated, and the radiative lifetimes of several A S states of PF and PF＋ are obtained.

关键词： A Precise Description of the Electronic structures and Spin-Allowed Transition Properties of PF and Its Cation:All-Electron Configuration-Interaction Investigations Including Relativistic Effect PF TDM

Surface-enhanced Raman Scattering Technology Based on WO_(3) Film for Detection of VEGF

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Chemical Research in Chinese Universities 2021年第4期37卷 900-905页

作者： LIU Xiaoyan ZHOU Yan ZHENG Tingting TIAN Yang School of Chemistry and molecular Engineering East China Normal UniversityShanghai200241P.R.China State Key Laboratory of Precision spectroscopy East China Normal UniversityShanghai200241P.R.China

With the advancement of nanomaterials for surface-enhanced Raman scattering(SERS) detection, a deeper understanding of the chemical mechanism(CM) and further applications has been achieved. Herein, we prepared a porous tungsten trioxide(WO_(3)) film by the pulse electrodeposition method, and constructed a WO3 film SERS aptasensor. With methylene blue(MB) as the adsorption molecule, the developed WO_(3) film SERS aptasensor revealed remarkable Raman activity. Through experimental data and theoretical calculations, we found that the significant SERS enhancement[enhancement factor(EF)=1.5× 10^(6)] was due to the CM based on charge transfer and molecular resonance. Utilizing the Raman response of MB on the WO3 film and specific aptamers, we successfully developed the aptamer sensor by covalently attaching the MB modified aptamer to the WO_(3) film. The sensor realized the specific and sensitive determination of vascular endothelial growth factor(VEGF) with the detection limit down to 8.7 pg/mL. In addition, the developed aptasensor indicated the excellent selectivity among other interferences, such as metal ions, reactive oxygen species(ROS), and proteins. This WO3 film SERS aptasensor not only contributed to the study of the enhancement mechanism of semiconductor material, but also provided a powerful platform for the sensitive detection of VEGF, possessing a great potential in the real-time monitoring of biomarkers of glioblastoma in vitro.

关键词： Glioblastoma WO_(3) Charge transfer Vascular endothelial growth factor(VEGF) Surface-enhanced Raman scattering

Influence of multi-photon excitation on the atomic above-threshold ionization

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Chinese Physics B 2015年第4期24卷 138-142页

作者：田原野王春成李苏宇郭福明丁大军 Roeterdink Wim-Ga 陈基根曾思良刘学深杨玉军 Institute of Atomic and molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and molecular spectroscopy Jilin University Department of Physics and Materials Engineering Taizhou University Data Center for High Energy Density Physics Institute of Applied Physics and Computational Mathematics Science and Technology Computational Physics Laboratory Institute of Applied Physics and Computational Mathematics

Using the time-dependent pseudo-spectral scheme, we solve the time-dependent Schrodinger equation of a hydrogen- like atom in a strong laser field in momentum space. The intensity-resolved photoelectron energy spectrum in abovethreshold ionization is obtained and further analyzed. We find that with the increase of the laser intensity, the abovethreshold ionization emission spectrum exhibits periodic resonance structure. By analyzing the population of atomic bound states, we find that it is the multi-photon excitation of bound state that leads to the occurrence of this phenomenon, which is in fairly good agreement with the experimental results.

关键词： time-dependent pseudo-spectral scheme above-threshold ionization resonance structure