A5064050048- Laser-Matter Interactions and Applications
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Laser Design and Applications
- Terahertz technology and applications
- Advanced Condensed Matter Physics
- Hydraulic and Pneumatic Systems
- Seismology and Earthquake Studies
- Magnetic and transport properties of perovskites and related materials
- Molecular spectroscopy and chirality
- Advanced Thermoelectric Materials and Devices
- Mechanical Engineering and Vibrations Research
- Advanced X-ray Imaging Techniques
- Structural Health Monitoring Techniques
- Geophysics and Sensor Technology
- Intermetallics and Advanced Alloy Properties
- Refrigeration and Air Conditioning Technologies
- Electron and X-Ray Spectroscopy Techniques
- Quantum optics and atomic interactions
- Atomic and Molecular Physics
- Gear and Bearing Dynamics Analysis
- Acoustic Wave Resonator Technologies
- Thermoelastic and Magnetoelastic Phenomena
Hung Yen University of Technology and Education
2025
Ho Chi Minh City University of Education
2015-2024
Computational Physics (United States)
2023
Ho Chi Minh City University of Technology
2015
Tula State University
2009-2012
In the claw-type vacuum pumps, rotor pair is a vital component, profiles are mainly affected by performance of pumps. Therefore, this study proposes novel profile for unequal considered geometry optimization to improve The proposed pair's geometric models and profile equations established since parameters evaluated optimized pump. Moreover, influence on working area ratio sealing line length presented. numerical results indicate that pumps with profiles has improved significantly compared...
Dynamic core-electron polarization (DCeP) is a correction to the single-active electron (SAE) approximation by considering response of core electrons time-dependent laser field. Despite being initially construed as perturbative correction, in some cases especially atoms and molecules with large polarizabilities, DCeP can qualitatively alter predictions produced bare SAE theory. In this study, we unambiguously demonstrate nonperturbative role resolved odd-even high-order harmonic generation...
We develop an approach to directly control the phase of electron's sub-cycle motion in intense laser field. The method is established by tuning a low-frequency electric field applied on centrosymmetric gaseous target during its interaction with few-cycle infrared pulse. find universal analytical relation between and induced harmonic frequency shift, derived strong-field approximation. This simple universality are confirmed numerically solving time-dependent Schrödinger equation. Moreover, we...
${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ represents a model system for probing geometrically frustrated magnetism, and studying the magnetic behavior of material under high pressure could yield new insights into magnetostructural coupling structurally driven ordering transitions that are otherwise not observable at ambient pressure. We report here systematic study crystal structures up to 37 20 GPa using x-ray neutron powder diffraction techniques, respectively. find upon compression, structure...
We present a detailed theoretical study of the odd-even harmonics generated from polar molecule CO by method based on numerically solving time-dependent Schrödinger equation within single-active-electron approximation. First, we reproduce pure even harmonic generation predicted theoretically Hu et al. using density functional theory [H. al., Phys. Rev. Lett., 2017, 119, 173201]. Then, Floquet approach, are able to attribute this behavior half-cycle mirror symmetry molecule-field system when...
It is argued that the dynamic core-electron polarization (DCEP) in polar molecules primarily affects harmonic processes at ionization step only. This manifestation can also be understood view of strong-field assumption parent ion's potential becomes irrelevant when electron accelerated continuum-energy region. However, scenario vastly different, especially case long-wavelength lasers as shown this paper, where we demonstrate a complete physical picture DCEP on process from asymmetric carbon...
Odd-even harmonic generation contains the system's dynamical symmetry breaking, and its decoding is desirable not only in understanding physics but also for applications of dynamics extraction. In this work we discover a simple universal relation between odd-even harmonics asymmetry terahertz (THz)-assisted laser-atomic system: atoms primary midinfrared laser pulse combined with THz laser. We demonstrate numerically then derive analytically dependence even-to-odd ratio on electric field....
We consider in a simple and general way elastic waves isotropic anisotropic media, their polarization, speeds, reflection from interfaces with mode conversion, surface waves. Reflection of quasi transverse media free is shown to be characterized by three critical angles.
For polar molecules, the degree of orientation is an essential variable with many interesting manifestations in strong-field phenomena. However, there no direct way to measure experiments. On other hand, current indirect methods based on high-order harmonic generation (HHG) require specific laser conditions for characterization. In this study, we propose a general method probe whole range degrees by calibrating time profile harmonics. To develop method, first study sensitivity and then...
A wide range of harmonics especially continuum is a prerequisite for attosecond pulse generation. One can use longer-wavelength lasers to push the cutoff higher order. However, this does not translate same amount extension because multiple rescattering phenomena are also enhanced in process, potentially affecting lower end harmonics. It then important understand exactly how rescatterings affect harmonic structure and their response various laser parameters, which main theme paper....
Retrieving atomic and molecular properties from entangling macroscopic measurements is an ambitious task. In particular, the phase difference between adjacent attosecond bursts emitted polar molecules of interest has been reconstructed measured high-order harmonic generation (HHG) when are exposed to intense laser pulse. However, besides ratio intensities even odd orders which can be directly, suggested construction method requires nonmeasured parameters that supplied through theoretical...
A recently developed quantitative rescattering theory showed that a laser-free elastic cross section can be separated from laser-induced electron diffraction (LIED) spectra. Based upon this idea, Blaga et al investigated the possibility of reconstructing molecular structure LIED spectra (2012 Nature 483 7388). In above study, an independent atoms model (IAM) was used to interpret high-energy electron–molecule collisions induced by mid-infrared laser. Our research aims extend application...
By numerically solving the time-dependent Schrödinger equation, we calculate ionization probability of a vibrating H2+ exposed to ultrashort intense laser fields. The results show that increases by time and gets saturation value. We also find with some first vibration levels, from higher level is larger than lower one. However, at certain will take maximum decrease next levels.
The effects of vibrational motions on dynamic Stark-induced π-electron rotations in a low-symmetry aromatic ring molecule are theoretically studied the adiabatic approximation. We adopt simplified three-electronic state model with few vibronic states. A pair lowest states two electronic excited is set degenerate by irradiation linearly polarized UV lasers. resultant named (DSIDVS). laser parameters (intensities and central frequencies) determined under conditions DSIDVS formation. molecules...
Ni[Formula: see text]Ti x MnSb polycrystalline alloys in the range [Formula: text] were synthesized employing standard solid-phase synthesis method. The crystal, magnetic, as well electrical properties of investigated using neutron powder diffraction and magneto-resistance measurements. results reveal that substitution Ti for Ni within temperature 2.5–300 K does not induce alterations crystal magnetic structures NiMnSb. ordered moment approaches zero. study transport alloys, where text], has...
Precise control of the electron phase accumulated during its sub-cycle motion within intense laser fields is essential in strong-field physics, yet remains mostly indirect and complicated so far. In this Letter, we develop a novel approach to by tuning low-frequency electric field applied on centrosymmetric gaseous target interaction with few-cycle infrared pulse. Our method based universal analytical relation between induced harmonic frequency shift, derived approximation. This simple...
Although the frequency shift and odd-even intensity modulation in high-order harmonic generation (HHG) have both been observed for asymmetric laser-target systems, they are typically studied as two separate phenomena. In this Letter, we provide a comprehensive picture of these nonlinear optical phenomena, unifying them through common origin - asymmetry system. By tuning discover transition from to upon increasing duration driving laser pulse. Specifically, phenomena simultaneously pulses...
Comprehensively and accurately characterizing matter information is the ultimate goal of physics chemistry, which can be achieved by conventional electron diffraction (CED) and, recently, laser-induced (LIED). Remarkably, latter method allows retrieval molecular structures during its rapid dynamical processes; however, nuclear vibrational effect still understudied. Moreover, if in CED LIED substantial, a natural question whether it possible to reconstruct anharmonic interatomic potential...
The two distinct manifestations of symmetry breaking in high-order harmonic generation, frequency shift and odd-even intensity modulation, are unified through a common origin - asymmetry the time domain.
Creating soft-Coulomb-type (SC) molecular potential within single-active-electron approximation (SAE) is essential since it allows solving time-dependent Schr\"odinger equations with fewer computational resources compared to other multielectron methods. The current available SC potentials can accurately reproduce the energy of highest occupied orbital (HOMO), which sufficient for analyzing nonlinear effects in laser-molecule interactions like high-order harmonic generation (HHG). However,...
We theoretically demonstrated that helical-photon-dressed states determine the rotational directions of π-electrons aromatic ring molecules formed by a circularly polarized or an elliptically laser. This theory was verified using minimal three-electronic-state model under frozen nuclei condition. The consists ground state and either doubly degenerate electronic excited two quasi-degenerate states. Three were derived solving time-dependent Schrödinger equation within semi-classical treatment...
Recently, we have visually elucidated the dynamics of high-order harmonic process an asymmetric CO molecule with a few-cycle laser pulse using Bohmian perspective and found that only one central trajectory, BT(P), whose initial start is near C atom, principally contributes to high-energy part spectrum. The role other trajectory originating O BT(N), remains question interest. present study shows non-negligible contribution BT(N) cause frequency shift in high spectrum when more optical cycles....