A systematic construction of Gaussian basis sets for the description of laser field ionization and high-harmonic generation
Aleksander P. Woźniak,Michał Lesiuk,Dmitry K. Efimov,Michał Mandrysz,Jakub S. Prauzner-Bechcicki,Marcelo F. Ciappina,Emilio Pisanty,Jakub Zakrzewski,Maciej Lewenstein,Robert Moszynski +9 more
TLDR
This paper explores the increasingly popular method of expanding the wavefunction of the examined system into a linear combination of atomic orbitals and presents a novel systematic scheme for constructing an optimal Gaussian basis set suitable for the description of excited and continuum atomic or molecular states.Abstract:
A precise understanding of mechanisms governing the dynamics of electrons in atoms and molecules subjected to intense laser fields has a key importance for the description of attosecond processes such as the high-harmonic generation and ionization. From the theoretical point of view this is still a challenging task, as new approaches to solve the time-dependent Schrodinger equation with both good accuracy and efficiency are still emerging. Until recently, the purely numerical methods of real-time propagation of the wavefunction using finite grids have been frequently and successfully used to capture the electron dynamics in small, one or two-electron systems. However, as the main focus of attoscience shifts towards many-electron systems, such techniques are no longer effective and need to be replaced by more approximate, but computationally efficient ones. In this paper we explore the increasingly popular method of expanding the wavefunction of the examined system into a linear combination of atomic orbitals, and present a novel systematic scheme for constructing an optimal Gaussian basis set suitable for the description of excited and continuum atomic or molecular states. We analyze the performance of the proposed basis sets by carrying out a series of time-dependent configuration interaction calculations for the hydrogen atom in fields of intensity varying from 5x10^13 W/cm2 to 5x10^14 W/cm2 . We also compare the results with data obtained using Gaussian basis sets proposed previously by other authors.read more
Citations
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Many-electron dynamics in laser-driven molecules: wavefunction theory vs. density functional theory
TL;DR: In this article, the authors compare TD-CIS combined with extended Atomic Orbital (AO) bases with RT-TD-DFT in a grid representation of the Kohn-Sham orbitals.
Peer Review
Quantum electrodynamics of ultra-intense laser-matter interactions
Philipp Stammer,Javier Rivera-Dean,A. S. Maxwell,Theocharis Lamprou,A. Ord'onez,Marcelo F. Ciappina,Paraskevas Tzallas,Maciej Lewenstein +7 more
TL;DR: In this article, a comprehensive fully quantized description of intense laser-atom interactions is provided, including the processes of high-harmonic generation, above-thresholdionization, and new phenomena that cannot be revealed within the context of semi-classical theories.
Journal ArticleDOI
Time-dependent ab initio approaches for high-harmonic generation spectroscopy
Emanuele Coccia,Eleonora Luppi +1 more
TL;DR: In this paper, a review of recent advances in modelling high-harmonic generation by means of ab initiotime-dependent approaches relying on the propagation of the time-dependent Schrodinger equation (or derived equations) in presence of a very intense electromagnetic field is presented.
Journal ArticleDOI
Gaussian-Type Orbital Calculations for High Harmonic Generation in Vibrating Molecules: Benchmarks for H2.
Christoph Witzorky,Guennaddi K. Paramonov,Foudhil Bouakline,Ralph Jaquet,Peter Saalfrank,Tillmann Klamroth +5 more
TL;DR: In this paper, a Gaussian-based, nonadiabatically coupled, time-dependent multisurface approach to treat quantum electron-nuclear motion beyond the Born-Oppenheimer approximation can be easily extended to approximate wavefunction methods, such as TD-CIS, for systems where no benchmarks are available.
Journal ArticleDOI
Effects of electronic correlation on the high harmonic generation in helium: A time-dependent configuration interaction singles vs time-dependent full configuration interaction study.
TL;DR: In this article , the effects of full electronic correlation on high harmonic generation in the helium atom subjected to laser pulses of extremely high intensity were investigated using quantum chemistry methods coupled to Gaussian basis sets.
References
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Gaussian basis sets for use in correlated molecular calculations. I. The atoms boron through neon and hydrogen
TL;DR: In this paper, a detailed study of correlation effects in the oxygen atom was conducted, and it was shown that primitive basis sets of primitive Gaussian functions effectively and efficiently describe correlation effects.
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TL;DR: During strong-field multiphoton ionization, a wave packet is formed each time the laser field passes its maximum value, and one important parameter which determines the strength of these effects is the rate at which the wave packet spreads in the direction perpendicular to the laser electric field.
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