A5068758172- Laser-Matter Interactions and Applications
- Nonlinear Optical Materials Studies
- Advanced Fiber Laser Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Quantum Chemical Studies
- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Photochemistry and Electron Transfer Studies
- Advanced Electron Microscopy Techniques and Applications
- Nuclear Physics and Applications
- Nuclear physics research studies
- Plasmonic and Surface Plasmon Research
- Electron and X-Ray Spectroscopy Techniques
- Laser-Plasma Interactions and Diagnostics
- Advanced NMR Techniques and Applications
- X-ray Diffraction in Crystallography
- Nonlinear Optical Materials Research
- Prostate Cancer Treatment and Research
- Quantum Information and Cryptography
- Laser Material Processing Techniques
- Force Microscopy Techniques and Applications
North China Electric Power University
2013-2024
City Of Hope National Medical Center
2023
China Institute of Atomic Energy
1983-2019
Shandong Normal University
2005-2019
Max Planck Institute for Nuclear Physics
2011-2016
Stanford University
2012
Louisiana State University
2012
Max Planck Society
2012
Argonne National Laboratory
2012
Linac Coherent Light Source
2012
Dissociative nuclear motion in core-excited molecular states leads to a splitting of the fragment Auger lines: Auger-Doppler effect. We present here for first time experimental evidence an effect following F1s → a(1g)* inner-shell excitation by circularly polarized x rays SF(6). In spite uniform distribution dissociating S-F bonds near polarization plane light, intersection between subpopulation molecules selected core with cone dissociation induces strong anisotropy that contributes...
We study the compression of strong x-ray pulses from free-electron lasers (XFELs) propagating through resonant medium atomic argon. The simulations are based on three-level model with frequency incident pulse tuned in $2{p}_{3/2}\text{\ensuremath{-}}4s$ resonance. propagation is accompanied by self-seeded stimulated Raman scattering (SRRS). SRRS starts two channels amplified spontaneous emission (ASE), $4s\text{\ensuremath{-}}2{p}_{3/2}$ and $3s\text{\ensuremath{-}}2{p}_{3/2}$, which form...
Resonant inelastic x-ray scattering (RIXS) is a major method for investigation of electronic structure and dynamics, with applications ranging from basic atomic physics to materials science. In RIXS applied inversion-symmetric systems, it has generally been accepted that strict parity selectivity applies in the sub–kilo–electron volt region. contrast, we show selection rule violated spectra free homonuclear diatomic O 2 molecule. By analyzing spectral dependence on angle, demonstrate...
The electroluminescence (EL) of molecules confined inside a nanocavity in the scanning tunneling microscope possesses many intriguing but unexplained features. We present here general theoretical approach based on density-matrix formalism to describe EL from near metal surface induced by both electron and localized plasmon excitations simultaneously. It reveals underlying physical mechanism for external bias dependent EL. important role played is highlighted. Calculations porphyrin...
Abstract Toroidal vortices, or vortex rings, are torus‐shaped vortices observed in various fluid systems. Recently, optical toroidal novel solutions to Maxwell's equations, have been experimentally (Nat. Photonics, 2022, 16, 519). Thus, their nanoplasmonic counterparts, namely plasmonic highly anticipated. This study aims elucidate the generation and manifestation of vortices. To achieve this, a technique involving illumination gold nanotorus with radially‐polarized beam is employed....
We study the role of propagation strong x-ray free-electron laser pulses on Auger effect. When system is exposed to a pulse stimulated emission starts compete with decay. As an illustration we present numerical results for Ar gas frequency incident tuned in $2{p}_{3/2}--4s$ resonance. It shown that accompanied by two channels amplified spontaneous emission, $4s--2{p}_{3/2}$ and $3s--2{p}_{3/2}$, which reshape when inverted. The population inversion quenched longer distances where lasing...
We devise a theoretical description for the response of nitrogen molecules (N2) to ultrashort and intense x rays from free electron laser Linac Coherent Light Source (LCLS). set out rate-equation x-ray absorption by atom. The equations are formulated using all one-x-ray-photon cross sections Auger radiative decay widths multiply-ionized atoms. Cross obtained with one-electron theory determined ab initio computations Dirac-Hartree-Slater (DHS) method. also calculate binding transition...
Structured light carrying orbital angular momentum (OAM) opens up a new physical dimension for studying light–matter interactions. Despite this, the complex fields created by OAM beams still remain largely unexplored in terms of their effects on surface plasmons. This paper presents revelation anomalous plasmon excitations single particles and couplings neighboring nanorods under beams, which are forbidden using non-OAM sources. The excitation nanoparticles is determined both photon spin...
We present a dynamical theory of nonlinear absorption and propagation laser pulses with duration in the microsecond time domain. The general is applied to fullerene C60 because its good optical limiting properties, namely, rather low ground state strong triplet-triplet absorption. It shown that sequential involving transitions major mechanism intrinsic hierarchy scales makes an adiabatic solution coupled rate equations valid, which therefore can be reduced single equation for population....
Abstract Quenching of vibrational excitations in resonant inelastic X-ray scattering (RIXS) spectra liquid acetic acid is observed. At the oxygen core resonance associated with localized at O–H bond, lack typical progression observed RIXS comparable systems. We interpret this phenomenon as due to strong rehybridization unoccupied molecular orbitals a result hydrogen bonding, which however cannot be x-ray absorption but only by means RIXS. This allows us address structure liquid, and...
The dynamics of pulse propagation accompanied by harmonic generation, stimulated Raman scattering, amplified spontaneous emission, and superfluorescence is studied near the two-photon resonance. We explore optical limiting intense short laser pulses. numerical solutions coupled Bloch Maxwell's equations for $4,{4}^{\ensuremath{'}}$-bis(dimethylamino) stilbene molecule are compared with area theorem. It shown that theorem explains qualitatively major dynamical properties even if generation...
The possibility of x-ray emission employing below-threshold-harmonic generation in the nontunneling regime is considered. interaction a tightly bound valence electron highly charged ion with intense extreme-ultraviolet laser radiation investigated weakly relativistic by numerical solution two-dimensional relativistically corrected Schr\"odinger equation. Nondipole effects and mass correction are taken into account expansion total Klein-Gordon Hamiltonian up to second order ratio between...
Observing and controlling molecular motion in particular rotation are fundamental topics physics chemistry. To initiate ultrafast rotation, one needs a way to transfer large angular momentum the molecule. As showcase, this was performed by hard X-ray C1s ionization of carbon monoxide accompanied spinning up molecule via recoil “kick” emitted fast photoelectron. visualize motion, we use dynamical rotational Doppler effect an “pump-probe” device offered nature itself: recoil-induced is probed...
We solve numerically the Maxwell-Bloch equations using an iterative predictor-corrector finite-difference time-domain technique to study propagation of femtosecond laser pulses in a strong two-photon absorption (TPA) organic molecular medium [4,4′-bis(dimethylamino) stilbene]. The hybrid density functional theory is used calculate electronic structures compound. system described by three-level model optical regime and has demonstrated good power limiting behavior certain intensity region....
We study theoretically the quantum dynamics of nitrogen molecules (N$_2$) exposed to intense and ultrafast x-rays at a wavelength 1.1 nm (1100 eV photon energy) from Linac Coherent Light Source (LCLS) free electron laser. Molecular rate equations are derived describe intertwined photoionization, decay, dissociation processes occurring for N$_2$. This model complements our earlier phenomenological approaches, single-atom, symmetric-sharing, fragmentation-matrix models J. Chem. Phys....
X-ray lasing is predicted to ensue when molecules are pumped into dissociative core-excited states by a free-electron-laser pulse. The due the population inversion created in neutral dissociation product, and process features self-trapping of x-ray pulse at gain ridge. Simulations performed for HCl molecule $2{p}_{1/2}\ensuremath{\rightarrow}6\ensuremath{\sigma}$ resonance demonstrate that scheme can be used create ultrashort coherent pulses.
We present the first experimental determination on spectroscopic amplitudes (SAs) for α-cluster in B11 ground state via Li7(Li6,d)11B reaction using a high-precision magnetic spectrograph. This is believed to have strong effect studies of α-induced reactions which are crucial nuclear astrophysics. It found that previous SAs from shell model calculations cause overestimations up 23% C12(α,γ)16O SE2(300) factor and 34% C13(α,n)16O S(190) with respect results experimentally determined SAs. Due...
Dynamics of multilevel molecules and pulse propagation is studied near the two-photon resonance. We have found a strict solution this problem beyond rotating wave approximation. Our analytical in close agreement with numerical for $4,{4}^{\ensuremath{'}}$-bis(dimethylamino) stilbene molecule. The compensation dynamical Stark shift fixed-in-space molecules. It shown that orientational disorder does not allow complete shift.
Resonant Auger spectra of ethene molecule have been measured with vibrational resolution at several excitation energies in the region C1s−11b2g(π*) resonance. The main features observed experiment assigned and are accurately interpreted on basis ab initio multimode calculations. Theory explains extended distribution resonant its evolution as a function energy by during scattering process. As result, display two qualitatively different spectral following Raman non-Raman dispersion laws,...
Resonant inelastic x-ray scattering accompanied by core-hole hopping induced a strong infrared-laser field is studied for the nitrogen molecule. This process involves laser-field-induced promotion of ungerade core holes created weak pulse to gerade level, which opens symmetry-forbidden channels and gives rise new features in spectrum. The within short lifetime core-excited state required observation described can be achieved at moderate intensities infrared $(\ensuremath{\sim}{10}^{12}\text{...
Orbital angular momentum (OAM) of light has the potential to induce high-order transitions electrons in atoms by compensating for OAM required. However, due dark spot situating at focal center beam, are typically weak. In this study, we demonstrate efficient and selective resonances symmetric asymmetric plasmonic nanoparticles that comparable size waist radius beam. a nanoparticle configured with complete nanoring lying on center, there is pure resonance obeying law conservation during...
In this paper, the equilibrium geometries, one-, two-, and three-photon absorption properties, transition nature of a series Y-shaped molecules which possess an imidazole-thiazole core have been theoretically studied by using parametrization model 3 Zerner's intermediate neglect differential overlap methods. Our calculated results confirmed experimental findings that investigated are all promising multiphoton materials both two-photon cross sections seriatim increscent along with increase...
Here we study the propagation of a strong X-ray free-electron pulse through resonant medium atomic Mg accompanied by self-seeded stimulated Raman scattering. The is decelerated two orders magnitude because nonlinear interaction and experiences 6-fold compression. simulations are based on strict numerical solution coupled Bloch Maxwell equations for 50 fs tuned in 2p3/2-4s resonance (54.8 eV). extensive ringing tail produced during widens power spectrum. This seed field triggers Stokes...