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Theoretical study of differential cross sections for the ionization of helium by fast proton impact

Chinese Physics B 2024年第11期33卷 255-264页

作者： M Mondal B Mandal T Mistry D Jana M Purkait Department of Physics Ramakrishna Mission Residential CollegeNarendrapurKolkata-700103India

We present the angular distribution of the ejected electron for single ionization of He by fast proton impact.A fourbody formalism of the three-Coulomb wave is applied to calculate the triple differential cross sections at several impact energies in the scattering,perpendicular and azimuthal ***,the three-body formalism of three-Coulomb,two-Coulomb and first Born approximation models has also been used to study the many-body effect on electron emission and the validity of the *** the three-Coulomb wave model,the final state wave function incorporates distortion due to the three-body mutual Coulombic *** this formalism,we use an uncorrelated and correlated Born initial state,which consists of a plane wave for the incoming projectile times a two-electron bound state wavefunction of the helium atom representing the 1s2(1S)***,in the case of the three-body formalism,the initial state wavefunction consists of a long-range Coulomb distortion for the incoming projectile and one active electron of the He atom described by the Roothaan–Hartree–Fock *** structure with a single or two peaks with unequal intensity is observed in the angular distributions of the triple differential cross sections for the different kinematic *** addition,the influence of static electron correlations is investigated using different bound state wavefunctions for the ground state of the He *** the four-body formalism,the present computations are very fast by reducing a nine-dimensional integral to a two-dimensional real *** the simplicity and speed of the proposed quadrature,the comparison shows that the obtained results are in reasonable agreement with the experiment and are compatible with those of other theories.

关键词： ionization cross sections collision atoms ions

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Ion acoustic solitary waves in an adiabatic dusty plasma:Roles of superthermal electrons,ion loss and ionization

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Chinese Physics B 2024年第8期33卷 337-342页

作者：饶强华陈辉刘三秋陈小昌 Department of Physics School of Physics and Materials ScienceNanchang UniversityNanchang 330031China Jiangxi Province Key Laboratory of Fusion and Information Control Nanchang UniversityNanchang 330031China

We investigate propagation of dust ion acoustic solitary wave(DIASW)in a multicomponent dusty plasma with adiabatic ions,superthermal electrons,and stationary *** reductive perturbation method is employed to derive the damped Korteweg-de Vries(DKdV)equation which describes *** result reveals that the adiabaticity of ions significantly modifies the basic features of the *** ionization effect makes the solitary wave grow,while collisions reduce the growth rate and even lead to the *** the increases in ionization cross sectionΔσ/σ_(0),ion-to-electron density ratioδ_(ie)and superthermal electrons parameterκ,the effect of ionization on DIASW enhances.

关键词： dust ion acoustic wave solitary wave ionization adiabatic process

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Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields

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Chinese Physics B 2019年第10期28卷 183-191页

作者： Xu-Cong Zhou Shang Shi Fei Li Yu-Jun Yang Jing Chen Qing-Tian Meng Bing-Bing Wang School of Physics and Electronics Shandong Normal UniversityJinan 250358China Laboratory of Optical Physics Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Insititute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Institute of Applied Physics and Computational Mathematics Beijing 100088China University of Chinese Academy of Sciences Beijing 100049China

According to the frequency-domain theory, we investigate the asymmetric structure of above-threshold ionization(ATI) spectrum of an atom in two-color elliptically polarized(EP) laser fields. When both laser fields are linearly polarized(LP), the spectrum shows that the multi-plateau structure is symmetric about the emitted angle of electron at π/2, while the spectrum becomes asymmetric and shifts rightwards with the increase of the EP degree of the IR laser field. Since the total ATI process is regarded as including direct ATI and the rescattering ATI, we analyze the spectrum structure of direct ATI and rescattering ATI separately. Using the saddle-point approximation, we find that for direct ATI, the fringes on the spectrum are mainly attributed to the fact that the ionization probability becomes very small when the direction of emitted electrons is perpendicular to the direction of the XUV laser polarization;while for the rescattering ATI, the interference fringes on the spectrum mainly come from the superposition of the waist structures on the spectra of all sub-channels.

关键词： above-threshold ionization elliptically polarized two color laser fields asymmetric structure

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Abnormal ionization in sonoluminescence

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Chinese Physics B 2015年第4期24卷 456-462页

作者：张文娟安宇 Department of Physics Tsinghua University High School Affiliated to Shanghai Jiao Tong University (Jia Ding Campus)

Sonoluminescence is a complex phenomenon, the mechanism of which remains unclear. The present study reveals that an abnormal ionization process is likely to be present in the sonoluminescing bubble. To fit the experimental data of previous studies, we assume that the ionization energies of the molecules and atoms in the bubble decrease as the gas density increases and that the decrease of the ionization energy reaches about 60%-70% as the bubble flashes, which is difficult to explain by using previous models.

关键词： sonoluminescence ionization ionized gas

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Numerical tests of theoretical models describing ionization of H(1s) atom by linearly polarized flat pulse of laser radiation

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Chinese Physics B 2018年第9期27卷 254-261页

作者： Jarostaw H Bauer Min Deng Katedra Fizyki Teoretycznej Wydzial Fizyki i lnformatyki Stosowanej Uniwersytetu LddzkiegoUI.Pomorska 149/153PL-90-236 LddlPoland State Key Laboratory o fLow-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China

We derive the well-known Coulomb correction factor for the Gordon-Volkov wave function describing an outgoing electron in the process of ionization in an intense laser field. Although rigorous treatment would limit its use only to laser fields much lower than the so-called barrier-suppression field, it appears that in practice the correction factor may be used also close to and even above this critical value of the laser field. We compare predictions of several analytical expressions describing ionization rate of the hydrogen atom in its ground state in the strong linearly polarized laser field. We also compare ionization probabilities obtained by integrating these ionization rates over a temporal envelope of the laser pulse with predictions based on the exact numerical solution to the time-dependent Schr ¨odinger equation.

关键词： laser fields ionization S-matrix Coulomb-Volkov wave function

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Double differential cross sections for ionization of H by 75 keV proton impact:Assessing the role of correlated wave functions

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Chinese Physics B 2020年第12期29卷 72-81页

作者： Jungang Fan Xiangyang Miao Xiangfu Jia Key Laboratory of Spectral Measurement and Analysis of Shanxi Province Shanxi Normal UniversityLinfen 041004China College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004China College of Chemistry and Materials Science Shanxi Normal UniversityLinfen 041004China

The effect of final-state dynamic correlation is investigated for ionization of atomic hydrogen by 75-keV proton impact by analyzing double differential cross *** final state is represented by a continuum correlated wave(CCW-PT)function which accounts for the interaction between the projectile and the target nucleus(PT interaction).The correlated final state is nonseparable solutions of the wave equation combining the dynamics of the electron motion relative to the target and projectile,satisfying the Redmond’s asymptotic conditions corresponding to long range *** transition matrix is evaluated using the CCW-PT function and the undistorted initial *** the correlation effects and the PT interaction are analyzed by the present *** convergence of the continuous correlated final state is examined *** results are compared with the absolute experimental data measured by Laforge et al.[***.103,053201(2009)]and Schulz et al.[***.A 81,052705(2010)],as well as other theoretical models(especially the results of the latest non perturbation theory).We have shown that the dynamic correlation plays an important role in the ionization of atomic hydrogen by proton *** overall agreement between theory and the experimental data is encouraging,detailed agreement is still ***,such an analysis is meaningful because it provides valuable information about the dynamical correlation and PT interaction in the CCW-PT theoretical model.

关键词： ionization three-body Coulomb problem correlated wave functions double differential cross section

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Xe-Kr laser induced collisional ionization system and experimental preparation of its initial state: Four-photon resonant excitation

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Chinese Physics B 2008年第12期17卷 4504-4509页

作者：张洪英鲁振中樊荣伟陈德应 National Key Laboratory of Tunable Laser Technology Institute of Opto-ElectronicsHarbin Institute of Technology

This paper proposes a novel one-colour Xe-Kr laser induced collisional ionization system. Considering the level scheme of the system, it finds that the initial state of the reaction--the four 4f levels with even J of Xe-can be prepared through method of four-photon resonant excitation by dye laser with wavelength of -440 nm. Absorption of an additional photon （the transfer laser） of the same wavelength will complete the laser induced collisional ionization process. The resonance enhanced ionization spectrum of Xe by four laser photons at -440nm is measured through time-of-flight mass spectrometry, this aims at the preparation of the initial state of the system proposed. The Stark broadening of the measured spectrum is observed and consistent with the previous study. Analysis of the measured resonance ionization spectrum implies the feasibility of -440 nm four-photon resonant excitation of the initial 4f state of the Xe Kr system proposed in this paper, which prepares for a further experiment of laser induced collisional ionization.

关键词： laser induced collision ionization four-photon resonant excitation time-of-flight mass spectrometry

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Femtosecond strong-field coherent control of nonresonant ionization with shaped pulses

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Chinese Physics B 2019年第3期28卷 153-160页

作者： Qiu-Nan Tong Zhen-Zhong Lian Liang Zhao Hong-Xia Qi Zhou Chen Zhan Hu Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province Jilin UniversityChangchun 130012China

The strong-field coherent control of the nonresonant ionization of nitrous oxide using shaped pulses is *** study the dependence of periodic coherent oscillation of the total ionization yield on the variation of laser phase parameters. The physical mechanism of the strong-field coherent control is investigated experimentally and theoretically by the nonresonant spectral phase interferences in the frequency domain. We show that the intense shaped pulses with broadband and off-resonance can be used as a robust strong-field coherent control method.

关键词： coherent control nonresonant ionization shaped pulse

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Photoelectron imaging of resonance-enhanced multiphoton ionization and above-threshold ionization of ammonia molecules in a strong 800-nm laser pulse

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Chinese Physics B 2019年第6期28卷 140-145页

作者： Le-Le Song Ya-Nan Sun Yan-Hui Wang Xiao-Chun Wang Lan-Hai He Si-Zuo Luo Wen-Hui Hu Qiu-Nan Tong Da-Jun Ding Fu-Chun Liu Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Institute of Chemical Technology Changchun 132022China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012China College of Electronic Science and Engineering State Key Laboratory on Integrated OptoelectronicsJilin UniversityChangchun 130012China

In this work, we mainly investigate the NH3 molecular multiphoton ionization process by using the photoelectron velocity map imaging technique. Under the condition of femtosecond laser(wavelength at 800 nm), the photoelectron images are detected. The channel switching and above-threshold ionization(ATI) effect are also confirmed. The kinetic energy spectrum(KES) and the photoelectron angular distributions(PADs) are obtained through the anti-Abel transformation from the original images, and then three ionization channels are confirmed successfully according to the Freeman resonance effect in a relatively low laser intensity region. In the excitation process, the intermediate resonance Rydberg states are C^1 A 1(6 + 2 photons process), B^1 E(6 + 2 photons process) and C^1 A 1(7 + 2 photons process), respectively. At the same time, we also find that the photoelectron angular distributions are independent of laser intensity. In addition, the electrons produced by different processes interfere with each other and they can produce a spider-like structure. We also find ac-Stark movement according to the Stark-shift-induced resonance effect when the laser intensity is relatively high.

关键词： photoelectron imaging Rydberg state resonance-enhanced multiphoton ionization photoelectron angular distribution

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Revisiting Laser-Intensity-Dependent ionization and Fragmentation of C60

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Chinese Physics Letters 2021年第8期38卷 32-37页

作者： D.P.Dong B.H.Yang D.B.Qian W.C.Zhou S.F.Zhang X.Ma Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

We revisit the laser-intensity-dependent ionization and fragmentation yields of C60 molecules irradiated by 25-fs,798-nm laser pulses based on the approach in which photoions are measured via a velocity map imaging spectrometer working in a time-sliced *** approach dramatically improves the signal-to-background ratio compared to those using a simple(traditional)time-of-flight mode(spectrometer),and thus allows us to measure the laser-intensity dependences down to a previously untouched region,which is expected to provide new insights into the intense-field ionization and fragmentation of ***,we find that the saturation intensities for C60 ionizations and the onset intensity for C60 fragmentation are much lower than those reported in previous ***,the derived saturation-intensity dependence on charge distribution demonstrates the validity of the over-the-barrier ionization using a conducting sphere model.

关键词： fragmentation saturation ionization

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