Publications (47)
Uncovering multiple orbitals influence in high harmonic generation from aligned N
Anh-Thu Le, R. R. Lucchese, C. D. Lin
Recent measurements on high-order harmonic generation (HHG) from N aligned perpendicular to the driving laser polarization [B. K. McFarland {\it el al}, Science {\bf 322}, 1232…
Separation of Target Structure and Medium Propagation Effects in High-Harmonic Generation
Cheng Jin, Hans Jakob Worner, V. Tosa +6
We calculate high-harmonic generation (HHG) by intense infrared lasers in atoms and molecules with the inclusion of macroscopic propagation of the harmonics in the gas medium. We s…
Polarization and ellipticity of high-order harmonics from aligned molecules generated by linearly polarized intense laser pulses
Anh-Thu Le, R. R. Lucchese, C. D. Lin
We present theoretical calculations for polarization and ellipticity of high-order harmonics from aligned N, CO, and O molecules generated by linearly polarized lasers.…
Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states
Wei-Chun Chu, C. D. Lin
We study theoretically the photoabsorption spectra of an attosecond XUV pulse by a laserdressed atomic system. A weak XUV excites an autoionizing state which is strongly coupled to…
Theory of ultrafast autoionization dynamics of Fano resonances
W. -C. Chu, C. D. Lin
We study atomic autoionization processes in the time domain. With the emerging attosecond extreme vacuum ultraviolet and soft x-ray pulses, we first address how to characterize the…
Retrieval of electron-atom scattering cross sections from laser-induced electron rescattering of atomic negative ions in intense laser fields
XiaoXin Zhou, Zhangjin Chen, Toru Morishita +2
We investigated the two-dimensional electron momentum distributions of atomic negative ions in an intense laser field by solving the time-dependent Schrodinger equation (TDSE) and…
Imaging the Renner-Teller effect using laser-induced electron diffraction
Kasra Amini, Michele Sclafani, Tobias Steinle +18
Structural information on electronically excited neutral molecules can be indirectly retrieved, largely through pump-probe and rotational spectroscopy measurements with the aid of…
Molecular structure retrieval directly from laboratory-frame photoelectron spectra in laser-induced electron diffraction
A. Sanchez, K. Amini, S. -J. Wang +12
Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching…
Probing Vibronic Coherence in Charge Migration of Molecules Using Strong Field Sequential Double Ionization
C. H. Yuen, C. D. Lin
We propose a novel scheme for probing vibronic coherence in charge migration in molecules utilizing strong field sequential double ionization. To demonstrate the feasibility of thi…
Medium propagation effects in high harmonic generation of Ar and N
Cheng Jin, Anh-Thu Le, C. D. Lin
We report theoretical calculations of high harmonic generation (HHG) by intense infrared lasers in atomic and molecular targets taking into account the macroscopic propagation of b…
Imaging an isolated water molecule using a single electron wave packet
Xinyao Liu, Kasra Amini, Tobias Steinle +12
Observing changes in molecular structure requires atomic-scale à ngstrom and femtosecond spatio-temporal resolution. We use the Fourier transform (FT) variant of laser-induced elec…
Quantitative Rescattering Theory for high-order harmonic generation from molecules
Anh-Thu Le, R. R. Lucchese, S. Tonzani +2
The Quantitative Rescattering Theory (QRS) for high-order harmonic generation (HHG) by intense laser pulses is presented. According to the QRS, HHG spectra can be expressed as a pr…
Probing dipole-forbidden autoionizing states by isolated attosecond pulses
Wei-Chun Chu, Toru Morishita, C. D. Lin
We propose a general technique to retrieve the information of dipole-forbidden resonances in the autoionizing region. In the simulation, a helium atom is pumped by an isolated atto…
Theory of high-order harmonic generation from molecules by intense laser pulses
Anh-Thu Le, R. Della Picca, P. D. Fainstein +3
We show that high-order harmonics generated from molecules by intense laser pulses can be expressed as the product of a returning electron wave packet and the photo-recombination c…
Probing molecular frame photoionization via laser generated high-order harmonics from aligned molecules
Anh-Thu Le, R. R. Lucchese, M. T. Lee +1
Present photoionization experiments cannot measure molecular frame photoelectron angular distributions (MFPAD) from the outermost valence electrons of molecules. We show that detai…
Theoretical analysis of dynamic chemical imaging with lasers using high-order harmonic generation
Van-Hoang Le, Anh-Thu Le, Rui-Hua Xie +1
We report theoretical investigations of the tomographic procedure suggested by Itatani {\it et al.} [Nature, {\bf 432} 867 (2004)] for reconstructing highest occupied molecular orb…
Intensity dependence of multiple orbital contributions and shape resonance in high-order harmonic generation of aligned N molecules}
Cheng Jin, Julien B. Bertrand, R. R. Lucchese +5
We report measurements and theoretical simulations of high-order harmonic generation (HHG) in aligned N molecules using a 1200-nm intense laser field when the generating pulse…
Attosecond light pulses to reveal the time-dependent rovibrational motion of the correlated electron pair in helium
Toru Morishita, Shinichi Watanabe, C. D. Lin
We illustrate how attosecond light pulses can be used to directly mapping out the time-dependence of the correlated motion of two excited atomic electrons, discuss how the two-elec…
Probing Molecular Dynamics at Attosecond Resolution with Femtosecond Laser Pulses
X. M. Tong, Z. X. Zhao, C. D. Lin
The kinetic energy distribution of D ions resulting from the interaction of a femtosecond laser pulse with D molecules is calculated based on the rescattering model. From a…
Correlation dynamics between electrons and ions in the fragmentation of D molecules by short laser pulses
X. M. Tong, Z. X. Zhao, C. D. Lin
We studied the recollision dynamics between the electrons and D ions following the tunneling ionization of D molecules in an intense short pulse laser field. The returnin…
Hyperspherical Close-Coupling Calculation of D-wave Positronium Formation and Excitation Cross Sections in Positron-Hydrogen Scattering
Yan Zhou, C. D. Lin
Hyperspherical close-coupling method is used to calculate the elastic, positronium formation and excitation cross sections for positron collisions with atomic hydrogen at energies…
Extension of all-optical reconstruction method for isolated attosecond pulses using high-harmonic generation streaking spectra
Kan Wang, Yong Fu, Baochang Li +5
An all-optical method for directly reconstructing the spectral phase of isolated attosecond pulse (IAP) has been proposed recently [New J. Phys. 25, 083003 (2023)]. This method is…
Calibration of distorted wave Born approximation for electron impact excitation of Ne and Ar at incident energies below 100 eV
Yaqiu Liang, Zhangjin Chen, D. H. Madison +1
We calibrate the distorted wave Born approximation (DWBA) for electron impact excitation processes empirically. Differential cross sections (DCS) for the excitation of the …
Crystal Symmetry and Polarization of High-order Harmonics in ZnO
Shicheng Jiang, Shima Gholam-Mirzaei, Erin Crites +5
We carried out a joint theoretical and experimental study of the polarization of high-order harmonics generated from ZnO by intense infrared laser pulses. Experimentally we found t…
Generation of isolated attosecond pulses in the far field by spatial filtering with an intense few-cycle mid-infrared laser
Cheng Jin, Anh-Thu Le, Carlos A. Trallero-Herrero +1
We report theoretical calculations of high-order harmonic generation (HHG) of Xe with the inclusion of multi-electron effects and macroscopic propagation of the fundamental and har…
Analysis of two-dimensional high-energy photoelectron momentum distributions in single ionization of atoms by intense laser pulses
Zhangjin Chen, Toru Morishita, Anh-Thu Le +1
We analyzed the two-dimensional (2D) electron momentum distributions of high-energy photoelectrons of atoms in an intense laser field using the second-order strong field approximat…
Adaptive Design for Contour Estimation from Computer Experiments with Quantitative and Qualitative Inputs
A. Shahrokhian, X. Deng, C. D. Lin +2
Computer experiments with quantitative and qualitative inputs are widely used to study many scientific and engineering processes. Much of the existing work has focused on design an…
How to obtain complex transition dipole moments satisfying crystal symmetry and periodicity from ab-initio calculations
Shicheng Jiang, Chao Yu, Jigen Chen +3
Transition dipole moments (TDM) between energy bands of solids deserve special attention nowadays as intense lasers can easily drive non-adiabatic transitions of excited electron w…
Potential for ultrafast dynamic chemical imaging with few-cycle infrared lasers
T Morishita, A. T. Le, Z. Chen +1
We studied the photoelectron spectra generated by an intense few-cycle infrared laser pulse. By focusing on the angular distributions of the back rescattered high energy photoelect…
Influence of gas pressure on high-order harmonic generation of Ar and Ne
Guoli Wang, Cheng Jin, Anh-Thu Le +1
We study the effect of gas pressure on the generation of high-order harmonics where harmonics due to individual atoms are calculated using the recently developed quantitative resca…
New determination of structure parameters in strong field tunneling ionization theory of molecules
Song-Feng Zhao, Cheng Jin, Anh-Thu Le +2
In the strong field molecular tunneling ionization theory of Tong et al. [Phys. Rev. A 66, 033402 (2002)], the ionization rate depends on the asymptotic wavefunction of the molecul…
Origin of Plateau and Species dependence of Laser-Induced High-Energy Photoelectron Spectra
Zhangjin Chen, Anh-Thu Le, Toru Morishita +1
We analyzed the energy and momentum distributions of laser-induced high-energy photoelectrons of alkali and rare gas atoms. For the plateau electrons with energies above , ($…
Laser-assisted-autoionization dynamics of helium resonances with single attosecond pulses
Wei-Chun Chu, Song-Feng Zhao, C. D. Lin
The strong coupling between two autoionizing states in helium is studied theoretically with the pump-probe scheme. An isolated 100-as XUV pulse is used to excite helium near the 2s…
Quantitative rescattering theory for laser-induced high-energy plateau photoelectron spectra
Zhangjin Chen, Anh-Thu Le, Toru Morishita +1
A comprehensive quantitative rescattering (QRS) theory for describing the production of high-energy photoelectrons generated by intense laser pulses is presented. According to the…
A robust all-non-optical method for the characterization of single-shot few-cycle laser pulses
Zhangjin Chen, T. Wittmann, C. D. Lin
An all non-optical method for accurately determining the pulse parameters of individual few-cycle laser shots is presented. By analyzing the "left" and "right" asymmetry of high-en…
Influence of orbital symmetry on diffraction imaging with rescattering electron wave packets
M. G. Pullen, B. Wolter, A. -T. Le +9
The ability to directly follow and time resolve the rearrangement of the nuclei within molecules is a frontier of science that requires atomic spatial and few-femtosecond temporal…
Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers
C. Trallero-Herrero, C. Jin, B. E. Schmidt +7
We present experimental results showing the appearance of a near-continuum in the high-order harmonic generation (HHG) spectra of atomic and molecular species as the driving laser…
Retrieval of interatomic separations of molecules from laser-induced high-order harmonic spectra
Van-Hoang Le, Ngoc-Ty Nguyen, C. Jin +2
We illustrate an iterative method for retrieving the internuclear separations of N, O and CO molecules using the high-order harmonics generated from these molecules by…
Absorption and emission of single attosecond light pulses in an autoionizing gaseous medium dressed by a time-delayed control field
Wei-Chun Chu, C. D. Lin
An extreme ultraviolet (EUV) single attosecond pulse passing through a laser-dressed dense gas is studied theoretically. The weak EUV pulse pumps the helium gas from the ground sta…
Coherence from multiorbital tunneling ionization of molecules
C. H. Yuen, C. D. Lin
We present a simple and general coherence model for multiorbital tunnel ionization of molecules, which we incorporate into our previously developed density matrix approach for sequ…
Improved Lewenstein model for high-order harmonic generation of atoms and molecules with scattering wavefunctions
Anh-Thu Le, Toru Morishita, C. D. Lin
We demonstrate a simple method to improve the Lewenstein model for the description of high-order harmonic generation (HHG). It is shown that HHG spectra can be expressed as the pro…
Accurate retrieval of structural information from laser-induced photoelectron and high-harmonic spectra by few-cycle laser pulses
Toru Morishita, Anh-Thu Le, Zhangjin Chen +1
By analyzing ``exact'' theoretical results from solving the time-dependent Schrödinger equation of atoms in few-cycle laser pulses, we established the general conclusion that diff…
Extraction of the species dependent dipole moment from high-order harmonic spectra in rare gas atoms
Anh-Thu Le, Toru Morishita, C. D. Lin
Based on high-order harmonic generation (HHG) spectra obtained from solving the time-dependent Schrodinger equation for atoms, we established quantitatively that the HHG yield can…
Resonant enhancement of a single attosecond pulse in a gas medium by a time-delayed control field
Wei-Chun Chu, C. D. Lin
An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through a dense helium gas…
Quantifying Robustness of Attosecond Transient Absorption Spectroscopy for Vibronic Coherence in Charge Migration
C. H. Yuen, C. D. Lin
Probing vibronic coherence in molecules has been a central topic in ultrafast science, as it is an essential prerequisite to monitoring electronic motion. While experiments have de…
Analysis of effects of macroscopic propagation and multiple molecular orbitals on the minimum in high-order harmonic generation of aligned CO
Cheng Jin, Anh-Thu Le, C. D. Lin
We report theoretical calculations on the effect of the multiple orbital contribution in high-order harmonic generation (HHG) from aligned CO with inclusion of macroscopic prop…
Unraveling nonadiabatic ionization and Coulomb potential effects in strong-field photoelectron holography
Xiaohong Song, Cheng Lin, Zhihao Sheng +6
Strong field photoelectron holography has been proposed as a means for interrogating the spatial and temporal information of electrons and ions in a dynamic system. After ionizatio…