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Title: Angle-dependent strong-field molecular ionization rates with tuned range-separated time-dependent density functional theory

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4961731· OSTI ID:1467880
 [1]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [3]
  1. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemistry
  2. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
  3. Louisiana State Univ., Baton Rouge, LA (United States). Center for Computation and Technology, Dept. of Chemistry

Strong-field ionization and the resulting electronic dynamics are important for a range of processes such as high harmonic generation, photodamage, charge resonance enhanced ionization, and ionization-triggered charge migration. Modeling ionization dynamics in molecular systems from first-principles can be challenging due to the large spatial extent of the wavefunction which stresses the accuracy of basis sets, and the intense fields which require non-perturbative time-dependent electronic structure methods. In this paper, we develop a time-dependent density functional theory approach which uses a Gaussian-type orbital (GTO) basis set to capture strong-field ionization rates and dynamics in atoms and small molecules. This involves propagating the electronic density matrix in time with a time-dependent laser potential and a spatial non-Hermitian complex absorbing potential which is projected onto an atom-centered basis set to remove ionized charge from the simulation. For the density functional theory (DFT) functional we use a tuned range-separated functional LC-PBE*, which has the correct asymptotic 1/r form of the potential and a reduced delocalization error compared to traditional DFT functionals. Ionization rates are computed for hydrogen, molecular nitrogen, and iodoacetylene under various field frequencies, intensities, and polarizations (angle-dependent ionization), and the results are shown to quantitatively agree with time-dependent Schrödinger equation and strong-field approximation calculations. In conclusion, this tuned DFT with GTO method opens the door to predictive all-electron time-dependent density functional theory simulations of ionization and ionization-triggered dynamics in molecular systems using tuned range-separated hybrid functionals.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012462
OSTI ID:
1467880
Alternate ID(s):
OSTI ID: 1315846
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 9; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (9)

Stochastic time-dependent DFT with optimally tuned range-separated hybrids: Application to excitonic effects in large phosphorene sheets journal May 2019
Linear-response range-separated density-functional theory for atomic photoexcitation and photoionization spectra journal June 2019
Angular dependence of strong field ionization of N 2 by time-dependent configuration interaction using density functional theory and the Tamm-Dancoff approximation journal August 2019
X-ray linear and non-linear spectroscopy of the ESCA molecule journal September 2019
Resolution-of-the-identity approximation for complex-scaled basis functions journal September 2019
Angle-dependent strong-field ionization of halomethanes journal November 2019
Self-consistent predictor/corrector algorithms for stable and efficient integration of the time-dependent Kohn-Sham equation journal January 2018
High-harmonic spectroscopy of transient two-center interference calculated with time-dependent density-functional theory journal July 2019
Stochastic Time-Dependent DFT with Optimally Tuned Range-Separated Hybrids: Application to Excitonic Effects in Large Phosphorene Sheets text January 2019

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