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- W4366178035 abstract "Real-time simulations of laser-driven electron dynamics contain information about molecular optical properties through all orders in response theory. These properties can be extracted by assuming convergence of the power series expansion of induced electric and magnetic multipole moments. However, the accuracy relative to analytical results from response theory quickly deteriorates for higher-order responses due to the presence of high-frequency oscillations in the induced multipole moment in the time domain. This problem has been ascribed to missing higher-order corrections. We here demonstrate that the deviations are caused by nonadiabatic effects arising from the finite-time ramping from zero to full strength of the external laser field. Three different approaches, two using a ramped wave and one using a pulsed wave, for extracting electrical properties from real-time time-dependent electronic-structure simulations are investigated. The standard linear ramp is compared to a quadratic ramp, which is found to yield highly accurate results for polarizabilities, and first and second hyperpolarizabilities, at roughly half the computational cost. Results for the third hyperpolarizability are presented along with a simple, computable measure of reliability." @default.
- W4366178035 created "2023-04-19" @default.
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- W4366178035 date "2023-04-17" @default.
- W4366178035 modified "2023-10-01" @default.
- W4366178035 title "Adiabatic extraction of nonlinear optical properties from real-time time-dependent electronic-structure theory" @default.
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- W4366178035 doi "https://doi.org/10.1063/5.0145521" @default.
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