Density Functional Theory Analysis of Raman Frequency Modes of Monoclinic Zirconium Oxide Using Gaussian Basis Sets and Isotopic Substitution

2010 ◽  
Vol 114 (29) ◽  
pp. 9323-9329 ◽  
Author(s):  
Damilola A. Daramola ◽  
Madhivanan Muthuvel ◽  
Gerardine G. Botte
Keyword(s):  
Density Functional Theory ◽  
Zirconium Oxide ◽  
Density Functional ◽  
Basis Sets ◽  
Raman Frequency ◽  
Isotopic Substitution ◽  
Theory Analysis ◽  
Gaussian Basis Sets ◽  
Functional Theory

Benchmark of Simplified Time-Dependent Density Functional Theory for UV-Vis Spectral Properties of Porphyrinoids

2019 ◽  
Author(s):  
Kamal Batra ◽  
Stefan Zahn ◽  
Thomas Heine
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Large Scale ◽  
Absolute Error ◽  
Time Dependent ◽  
Basis Set ◽  
Basis Sets ◽  
Functional Theory ◽  
Framework Materials ◽  
Dependent Density

<p>We thoroughly benchmark time-dependent density- functional theory for the predictive calculation of UV/Vis spectra of porphyrin derivatives. With the aim to provide an approach that is computationally feasible for large-scale applications such as biological systems or molecular framework materials, albeit performing with high accuracy for the Q-bands, we compare the results given by various computational protocols, including basis sets, density-functionals (including gradient corrected local functionals, hybrids, double hybrids and range-separated functionals), and various variants of time-dependent density-functional theory, including the simplified Tamm-Dancoff approximation. An excellent choice for these calculations is the range-separated functional CAM-B3LYP in combination with the simplified Tamm-Dancoff approximation and a basis set of double-ζ quality def2-SVP (mean absolute error [MAE] of ~0.05 eV). This is not surpassed by more expensive approaches, not even by double hybrid functionals, and solely systematic excitation energy scaling slightly improves the results (MAE ~0.04 eV). </p>

Estimating the adsorption energy of element 113 on a gold surface

Open Physics ◽  
2013 ◽  
Vol 11 (11) ◽  
Author(s):  
Alexander Rusakov ◽  
Yuriy Demidov ◽  
Andréi Zaitsevskii
Keyword(s):  
Adsorption Energy ◽  
Cluster Size ◽  
Density Functional ◽  
Gold Surface ◽  
Gold Clusters ◽  
Basis Sets ◽  
Energy Estimates ◽  
First Principle ◽  
Gaussian Basis Sets ◽  
Functional Theory

AbstractWe report first-principle based studies of element 113 (E113) interactions with gold aimed primarily at estimating the adsorption energy in thermochromatographic experiments. The electronic structure of E113-Aun systems was treated within the accurate shape-consistent small core relativistic pseudopotential framework at the level of non-collinear relativistic density functional theory (RDFT) with specially optimised Gaussian basis sets. We used gold clusters with up to 58 atoms to simulate the adsorption site on the stable Au(111) surface. Stabilization of the E113-Aun binding energy and the net Bader charge of E113 and the neighboring Au atoms with respect to n indicated the cluster size used was appropriate. The resulting adsorption energy estimates lie within the 1.0–1.2 eV range, substantially lower than previously reported values.

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