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Search Results: 1 - 10 of 42569 matches for " Xu Zhizhan "
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The evolution of molecular wave packet in superstrong laser fields
Suxing Hu,Zhizhan Xu
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882516
Abstract: In this note wc numerically simulate the wave packet evolution of H2 + in superstrong laser fields with the multiple electronic-states model. The result is that the evolution process of H2 + wave packet is mainly determined by the laser frequency. For the high-frequency fields H2 + wave packet extends out of the interaction region step by step. However, the H2 + wave packet is quickly dissociated in low-frequency fields. In addition, the molecular stabilization effect can be characterized at the intensity of 8 × 1015 W/cm2 for the low-frequency field ω1.
The evolution of molecular wave packet in superstrong laser fields

Hu Suxing,Xu Zhizhan,

科学通报(英文版) , 1997,
Abstract: Summary In this note wc numerically simulate the wave packet evolution of H2 + in superstrong laser fields with the multiple electronic-states model. The result is that the evolution process of H2 + wave packet is mainly determined by the laser frequency. For the high-frequency fields H2 + wave packet extends out of the interaction region step by step. However, the H2 + wave packet is quickly dissociated in low-frequency fields. In addition, the molecular stabilization effect can be characterized at the intensity of 8 × 1015 W/cm2 for the low-frequency field ω1.
Wavelength scaling of high-order harmonic yield from an optically prepared excited state atom
Jing Chen,Ya Cheng,Zhizhan Xu
Physics , 2009, DOI: 10.1088/1367-2630/11/11/113021
Abstract: Wavelength scaling law for the yield of high-order harmonic emission is theoretically examined for excited state atoms which are optically prepared by simultaneously exposing to an extreme ultraviolet pulse at the resonant wavelength and an infrared pulse at a variable wavelength in the range of 0.8\mum-2.4\mum. Numerical simulations are performed based on the three-dimensional time-dependent Schrodinger equation (3D TDSE) for Ne and H. We confirm that the harmonic yield follows a \lambda^-{4-6} scaling with the single fundamental driving laser pulse; whereas for the optically prepared excited state atoms, a \lambda^-{2-3} scaling for the harmonic yield is revealed.
Condition of laser pulse width for relativistic self-focusing
Guihua Zeng,Wei Yu,Baifei Shen,Zhizhan Xu
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182615
Abstract:
Laser-polarization-dependent photoelectron angular distributions from polar molecules
Xiaosong Zhu,Qingbin Zhang,Weiyi Hong,Peixiang Lu,Zhizhan Xu
Physics , 2011, DOI: 10.1364/OE.19.024198
Abstract: Photoelectron angular distributions (PADs) of oriented polar molecules in response to different polarized lasers are systematically investigated. It is found that the PADs of polar CO molecules show three distinct styles excited by linearly, elliptically and circularly polarized lasers respectively. In the case of elliptical polarization, a deep suppression is observed along the major axis and the distribution concentrates approximately along the minor axis. Additionally, it is also found that the concentrated distributions rotate clockwise as the ellipticity increases. Our investigation presents a method to manipulate the motion and angular distribution of photoelectrons by varying the polarization of the exciting pulses, and also implies the possibility to control the processes in laser-molecule interactions in future work.
Ultrafast laser-induced subwavelength structures towards nanoscale: the significant role of plasmonic effects
Min Huang,Ya Cheng,Fuli Zhao,Zhizhan Xu
Physics , 2011,
Abstract: Nowadays, via controlling surface plasmons (SPs) on elaborate man-made structures, plasmonics aiming at manipulating light beyond the diffraction limit has aroused great interest. Here, nevertheless, we demonstrate in short-pulse laser ablation ultrafast active plasmonic structures spontaneously generate in virtue of plasmonic effects rather than human ingenuity. First, the splitting of laser-induced subwavelength gratings that is experimentally evidenced on ZnO, Si, and GaAs, is confirmed to originate in the conversion of SP modes from the resonant to the nonresonant mode and further to the inphase or antiphase asymmetric mode. Further, as pulse number increases the universal scaling-down of laser-induced structures is derived from the conversion of physical regimes of plasmonic interaction from the optical to the electrostatic regime, which may arouse quasistatic SPs with interacting scales far beyond the diffraction limit and result in the ultrafast, non-thermal ablation for extraordinary electrostatic enhancement. Generally, the plasmonic mechanisms reveal the link between the deep-subwavelength space-scale and the ultra-short timescale for ultrafast laser-induced nanostructures: basically, "nanoscale" tends to eliminate electromagnetic retardation effects and bring an instant respond to the incident field, and arouse electrostatic interactions with giant local-field enhancement facilitating ultrafast ablation driven by tremendous electrostatic forces. Thus, active plasmonic structures provided with simultaneous "nanoscale" and "ultrafast" is apt to form in ultrafast ablation. In addition, the plasmonic mechanisms can act as a powerful "evolutionary force" acting in multipulse ablation and promoting the growth of resonant nanostructures-various typical plasmonic structures may be self-generated through multipulse evolution, which can be considered as a kind of natural plasmonics.
Initial carrier-envelope phase of few-cycle pulses determined by THz emission from air plasma
Rongjie Xu,Ya Bai,Liwei Song,Peng Liu,Ruxin Li,Zhizhan Xu
Physics , 2013, DOI: 10.1063/1.4817975
Abstract: The evolution of THz waveform generated in air plasma provides a sensitive probe to the variation of the carrier envelope phase (CEP) of propagating intense few-cycle pulses. Our experimental observation and calculation reveal that the number and positions of the inversion of THz waveform are dependent on the initial CEP, which is near 0.5{\pi} constantly under varied input pulse energies when two inversions of THz waveform in air plasma become one. This provides a method of measuring the initial CEP in an accuracy that is only limited by the stability of the driving few-cycle pulses.
Extending harmonic order with a half-cycle-delayed pulse
Suxing Hu,Zhizhan Xu,Xuexin Li,Shensheng Han,Xuehui Zhang,Wenqi Zhang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882434
Abstract:
Ionization and dissociation of acetonitrile by intense femtosecond laser pulse
Chengyin Wu,Yijia Xiong,Zhen Gao,Fan’ao Kong,Haihe Lu,Xiaodong Yang,Zhizhan Xu
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02909685
Abstract: Photoionization and photodissociation of CH3CN were studied by a linear time of flight mass spectrometer coupled with 800 nm, 50 fs laser pulses at intensities of 6.3×1013 1.2×1014 W/cm2. The laser power dependences for principal ions CH3CN+, CH2CN+, CHCN+ and CCN+ were measured, which are consistent with the numbers of photons required to produce the ions via multiphoton ionization and dissociation. The results show that eight-photon non-resonant multiphoton ionization is the main photoionization mechanism of the parent ion CH3CN+, while the fragment ions were produced through the dissociation of the molecules in the super-excited states.
Extending harmonic order with a half-cycle-delayed pulse

Hu Suxing,Xu Zhizhan,Li Xuexin,Han Shensheng,Zhang Xuehui,Zhang Wenqi,

科学通报(英文版) , 1997,
Abstract:
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