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Direct Observation on H-Elimination Enhancement from C_(2)H_(4) through Non-Adiabatic Process by Femtosecond Laser Induced Coulomb Explosion

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Chinese Physics Letters 2024年第5期41卷 17-22页

作者：金无维王春成赵晓戈杨译章任殿相刘泽槿李孝开罗嗣佐丁大军 Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy Jilin UniversityChangchun 130012China

Ethylene, the simplest model of a carbon-carbon double bond system, is pivotal in numerous chemical and biological processes. By employing intense infrared laser pump-probe techniques alongside coincidence measurements, we investigate the ultrafast non-adiabatic dynamics involved in the breakage of carbon-carbon double bonds and hydrogen elimination in dissociation of ethylene. Our study entails analyzing the dynamic kinetic energy release spectra to assess three bond-breaking scenarios, movements of nuclei, and structural changes around the carbon atoms. This allows us to evaluate the relaxation dynamics and characteristics of various dissociative states. Notably, we observe a significant rise in the yield of fragments resulting from C–H bond breakage with the delay time extended, suggesting non-adiabatic coupling through conical intersections from C–C bond breakage as a probable cause.

关键词： pump Femto adiabatic

Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse

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Chinese Physics B 2024年第3期33卷 433-440页

作者：王源李玉龙乔月高娜郭福明陈洲赫兰海杨玉军赵曦王俊 Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy Jilin UniversityChangchun 130012China Beijing Institute of Space Launch Technology Beijing 100076China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710062China

We delve into the phenomenon of high-order harmonic generation within a helium atom under the influence of a plasmon-assisted shaping *** findings reveal an intriguing manipulation of the frequency peak position in the harmonic emission by adjusting the absolute phase parameter within the frequency domain of the shaping *** phenomenon holds potential significance for experimental setups necessitating precisely tuned single ***,we observe a modulated shift in the created harmonic photon energy,spanning an impressive range of 1.2 *** frequency peak shift is rooted in the asymmetry exhibited by the rising and falling edges of the laser pulse,directly influencing the position of the peak frequency *** study quantifies the dependence of this tuning range and the asymmetry of the laser pulse,offering valuable insights into the underlying mechanisms driving this ***,our investigation uncovers the emergence of semi-integer order harmonics as the phase parameter is *** attribute this discovery to the intricate interference between harmonics generated by the primary and secondary return *** observation introduces an innovative approach for generating semi-integer order harmonics,thus expanding our understanding of high-order harmonic ***,our work contributes to the broader comprehension of complex phenomena in laser-matter interactions and provides a foundation for harnessing these effects in various applications,particularly those involving precise spectral control and the generation of unique harmonic patterns.

关键词： high-order harmonic semi-integer-order spectra shift inhomogeneous field

Modulation of High-Order Harmonic Generation from a Monolayer ZnO by Co-rotating Two-Color Circularly Polarized Laser Fields

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Chinese Physics Letters 2024年第1期41卷 34-38页

作者：乔月陈家祺周书山陈基根蒋士成杨玉军 School of Materials Science and Engineering Taizhou UniversityJiaojiang 318000China Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy(jilin University) Changchun 130012China School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029China State key laboratory of Precision spectroscopy East China Normal UniversityShanghai 200062China

By numerically solving the two-dimensional semiconductor Bloch equation,we study the high-order harmonic emission of a monolayer ZnO under the driving of co-rotating two-color circularly polarized laser *** changing the relative phase between the fundamental frequency field and the second one,it is found that the harmonic intensity in the platform region can be significantly *** the higher order,the harmonic intensity can be increased by about one order of *** time-frequency analysis,it is demonstrated that the emission trajectory of monolayer ZnO can be controlled by the relative phase,and the harmonic enhancement is caused by the second quantum trajectory with the higher emission *** addition,near-circularly polarized harmonics can be generated in the co-rotating two-color circularly polarized *** the change of the relative phase,the harmonics in the platform region can be altered from left-handed near-circularly polarization to right-handed *** results can obtain high-intensity harmonic radiation with an adjustable ellipticity,which provides an opportunity for syntheses of circularly polarized attosecond pulses.

关键词： polarization rotating harmonic

Internal collision double ionization of molecules driven by co-rotating two-color circularly polarized laser pulses

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Chinese Physics B 2024年第1期33卷 355-361页

作者：李雪峰乔月吴丹蔚瑞贤陈基根王俊郭福明杨玉军 Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy Changchun 130012China School of Science Jilin Institute of Chemical TechnologyJilin 132022China Zhejiang provincial key laboratory for Cutting Tools Taizhou UniversityJiaojiang 318000China

The double ionization process of molecules driven by co-rotating two-color circularly polarized fields is investigated with a three-dimensional classical ensemble model. Numerical results indicate that a considerable part of the sequential double ionization(DI) events of molecules occur through internal collision double ionization(ICD), and the ICD recollision mechanism is significantly different from that in non-sequential double ionization(NSDI). By analyzing the results of internuclear distances R = 5 a.u. and 2 a.u., these two recollision mechanisms are studied in depth. It is found that the dynamic behaviors of the recollision mechanisms of NSDI and ICD are similar. For NSDI, the motion range of electrons after the ionization is relatively large, and the electrons will return to the core after a period of time. In the ICD process,electrons will rotate around the parent ion before ionization, and the distance of the electron motion is relatively small. After a period of time, the electrons will come back to the core and collide with another electron. Furthermore, the molecular internuclear distance has a significant effect on the electron dynamic behavior of the two ionization mechanisms. This study will help to understand the multi-electron ionization process of complex systems.

关键词： non-sequential double ionization internuclear distance internal-collision circularly polarized laser field

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

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Chinese Physics B 2024年第5期33卷 459-464页

作者：肖礴赵逸文程方晶王革文姜威王一琛胡杰梁红静马日 Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China College of Science Jilin Institute of Chemical TechnologyJilin 132022China

In high harmonic generation(HHG),Laguerre–Gaussian(LG) beams are used to generate extreme ultraviolet(XUV)vortices with well-defined orbital angular momentum(OAM),which have potential applications in fields such as microscopy and *** experimental study on the HHG driven by vortex and Gaussian beams is conducted in this *** is found that the intensity of vortex harmonics is positively correlated with the laser energy and gas *** structure and intensity distribution of the vortex harmonics exhibit significant dependence on the relative position between the gas jet and the laser *** ring-like structures observed in the vortex harmonics,and the interference of quantum paths provide an explanation for the distinct structural ***,by adjusting the relative position between the jet and laser focus,it is possible to discern the contributions from different quantum *** optimization of the HH vortex field is applicable to the XUV,which opens up a new way for exploiting the potential in optical spin or manipulating electrons by using the photon with tunable orbital angular momentum.

关键词： high harmonic generation phase matching extreme ultraviolet vortex beam quantum path interference

Amplitude and rotation of the ellipticity of harmonics from a linearly polarized laser field

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Chinese Physics B 2022年第10期31卷 88-95页

作者： Ping Li Na Gao Rui-Xian Yu Jun Wang Su-Yu Li Fu-Ming Guo Yu-Jun Yang Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy(jilin University) Changchun 130012China

We simulate the dynamic response of H^(+)_(2) in a linearly polarized laser field by numerically solving the time-dependent Schr?dinger *** elliptically polarized high-order harmonics generated by H^(+)_(2)irradiated by the linearly polarized laser field are systematically *** result shows that the amplitude and rotation of the ellipticity of harmonics are affected by the alignment angle and internuclear distance of the *** the change in forces acted on the ionized electrons and the trajectories of the electrons,the phenomena are found to be due to the change in the direction of the total Coulomb forces from the two nuclei felt by the recollided ionized electrons in the direction perpendicular to the laser polarization *** on the influence law,we can select the harmonics with a specific frequency band under different alignment angles and then synthesize the isolated attosecond pulses with different rotations,which can be continuously converted from right-handed circular polarization,linear polarization,and left-handed circular polarization by changing the alignment *** study provides a new possible approach to the real-time detection of molecular states by using attosecond pulses and obtaining more optimized harmonics with molecular properties.

关键词： high-order harmonic ellipticity rotation attosecond pulses

Dynamic stabilization of atomic ionization in a high-frequency laser field with different initial angular momenta

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Chinese Physics B 2022年第10期31卷 82-87页

作者： Di-Yu Zhang Yue Qiao Wen-Di Lan Jun Wang Fu-Ming Guo Yu-Jun Yang Da-Jun Ding Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy(jilin University) Changchun 130012China

We investigated the ionization of an atom with different orbital angular momenta in a high-frequency laser field by solving the time-dependent Schr¨odinger *** results showed that the ionization stabilization features changed with the relative direction between the angular momentum of the initial state and the vector field of the laser *** ionization mechanism of the atom irradiated by a high frequency was explained by calculating the transition matrix and evolution of the time-dependent wave *** study can provide comprehensive understanding to improve atomic nonadiabatic ionization.

关键词： stabilization of atomic ionization atomic initial states

Ultrafast dynamics of cationic electronic states of vinyl bromide by strong-field ionization-photofragmentation

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Chinese Physics B 2022年第2期31卷 641-645页

作者： Long-Xing Zhou Yang Liu Shen He Da-Shuai Gao Xing-Chen Shen Qi Chen Tao Yu Hang Lv Hai-Feng Xu Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China jilin provincial key laboratory of applied atomic and molecular spectroscopy Jilin UniversityChangchun 130012China

Strong field ionization-photofragmentation(SFI-PF)with ultrafast pump–probe scheme is a powerful approach to study the dynamics of molecular cationic electronic *** we carry out a SFI-PF study on the cationic electronic states of vinyl bromide,C_(2)H_(3)*** yields of the parent C_(2)H_(3)Br_(+)and the formation of the fragment(Br^(+),C_(2)H^(+)2 and C_(2)H^(+)3)ions have been measured at different pump–probe delay *** provides experimental evidence of A^(2)A'–X^(2)A'' internal conversion of vinyl bromide cations which occurs in a time of about 220 fs,and the time of C_(2)H_(3)^(+) formation induced by the dissociation of the A^(2)A' state around 300 *** study would add our knowledge of the behavior of electronic excited states of complex molecular cations.

关键词： strong field ionization ultrafast dynamics vinyl bromide cation

TiO_2 composite electron transport layers for planar perovskite solar cells by mixed spray pyrolysis with precursor solution incorporating TiO_2 nanoparticles

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Chinese Physics B 2018年第1期27卷 121-126页

作者：田嘉琪李红翠王海月郑博薛叶斌刘喜哲 Institute of atomic and molecular Physics Jilin Provincial Key Laboratory of Applied Atomic and Molecular SpectroscopyJilin University

Perovskite solar cells with planar structure are attractive for their simplified device structure and reduced hysteresis effect. Compared to conventional mesoporous devices, TiO2 porous scaffold layers are removed in planar devices. Then, compact TiO2 electron transport layers take the functions of extracting electrons, transporting electrons, and blocking holes. Therefore, the properties of these compact TiO2 layers are important for the performance of solar cells. In this work, we develop a mixed spray pyrolysis method for producing compact TiO2 layers by incorporating TiO2 nanoparticles with dif- ferent size into the precursor solutions. For the optimized nanoparticle size of 60 nm, a power conversion efficiency of 16.7% is achieved, which is obviously higher than that of devices without incorporated nanoparticles （9.9%）. Further in- vestigation reveals that the incorporation of nanoparticles can remarkably improve the charge extraction and recombination processes.

关键词： perovskite solar cell electron transport layer charge extraction recombination