Analysis of the multielectron dynamics in intense laser-induced ionization of CO by the time-dependent effective potentials for natural orbitals

2020 ◽  
Vol 53 (18) ◽  
pp. 184001
Author(s):  
Shu Ohmura ◽  
Tsuyoshi Kato ◽  
Hideki Ohmura ◽  
Shiro Koseki ◽  
Hirohiko Kono
Keyword(s):  
Time Dependent ◽  
Intense Laser ◽  
Natural Orbitals ◽  
Effective Potentials

Nonlinear time-dependent density functional theory investigation and visualization of ionizations in CO2 — Effects of laser intensities and molecular orientations

2010 ◽  
Vol 88 (11) ◽  
pp. 1186-1194
Author(s):  
Emmanuel Penka Fowe ◽  
André Dieter Bandrauk
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Laser Pulses ◽  
Time Dependent ◽  
Intense Laser ◽  
Functional Theory ◽  
Intense Laser Pulses ◽  
Highest Occupied Molecular Orbital ◽  
Analysis Of The Images ◽  
Dependent Density

Time-dependent density functional theory (TDDFT) studies of the ionization of CO2 by intense laser pulses Io ≥ 1 × 1014 W/cm2, at 800 nm are presented using the LB94 and the LDA potentials. Results reveal that for lower laser peak intensity, Io = 3.5 × 1014 W/cm2, the highest occupied molecular orbital (HOMO) contributes significantly to ionization owing to its lower ionization potential (IP), whereas the inner orbitals play the important role for higher laser peak intensities. Even though such lower orbitals have higher IP, the ionization process occurs when orbital densities are maximum along the direction of the laser field polarization. These findings are confirmed through the analysis of the images from the time-dependent electron localization function (TDELF) and the spectra of higher order harmonic generation (HOHG). Additionally, in spite of the IP difference between Kohn–Sham orbitals from LDA and LB94 potentials, our results show almost the same trend for both.

scholarly journals Numerical stability of time-dependent coupled-cluster methods for many-electron dynamics in intense laser pulses

2020 ◽  
Vol 152 (7) ◽  
pp. 071102 ◽  
Author(s):  
Håkon Emil Kristiansen ◽  
Øyvind Sigmundson Schøyen ◽  
Simen Kvaal ◽  
Thomas Bondo Pedersen
Keyword(s):  
Numerical Stability ◽  
Laser Pulses ◽  
Time Dependent ◽  
Intense Laser ◽  
Coupled Cluster ◽  
Electron Dynamics ◽  
Coupled Cluster Methods ◽  
Intense Laser Pulses ◽  
Cluster Methods

Slim: a Personal Computer Based Software for Simulation of Laser Interaction with Materials

1991 ◽  
Vol 236 ◽  
Author(s):  
Rajiv K. Singh ◽  
John Viatella
Keyword(s):  
Laser Irradiation ◽  
Personal Computer ◽  
Rapid Heating ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Time Dependent ◽  
Intense Laser ◽  
Laser Interaction ◽  
History Of ◽  
Short Laser Pulses

AbstractA user-friendly, personal computer (PC) based routine called SLIM [Simulation of Laser Interaction with Materials] has been developed to understand the non-equilibrium effects of high intensity, short laser pulses on different materials. By employing an accurate implicit finite difference scheme with varying spatial and temporal node dimensions, the time-dependent thermal history of laser-irradiated material can be accurately and quickly determined. This program can take into account the temperature dependent optical and thermal properties of the solid, time dependent laser pulse intensity, and formation and propagation of the melt and/or vaporization interfaces induced by intense laser irradiation. The program can also simulate thermal effects on multilayer structures exposed to pulsed laser irradiation It is expected that this simulation routine will be indispensable to all researchers working in the area of pulsed laser processing of materials, including rapid heating, melting, annealing, laser doping, laser deposition of thin films and laser solidification processing.

SATURATION OF NONLINEAR SUSCEPTIBILITY

2004 ◽  
Vol 13 (02) ◽  
pp. 301-313 ◽  
Author(s):  
MUHAMMAD NURHUDA ◽  
AKIRA SUDA ◽  
KATSUMI MIDORIKAWA
Keyword(s):  
Numerical Solution ◽  
Laser Field ◽  
Schrodinger Equation ◽  
Kerr Nonlinearity ◽  
Time Dependent ◽  
Intense Laser ◽  
Nonlinear Susceptibility ◽  
Intense Laser Field ◽  
Low Intensity ◽  
Intensity Regime

The nonlinear susceptibility of atoms interacting with an intense laser field has been investigated using numerical solution of the time-dependent Schrödinger equation. It was found that the behavior of nonlinear susceptibility strongly depends on the intensity; it increases linearly in low intensity regime (Kerr nonlinearity), then saturates at higher intensity. Furthermore, it has also been found that the nonlinear susceptibility is substantially influenced by the onset of ionization.

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