scholarly journals Quantum Chemical Benchmark Energy and Geometry Database for Molecular Clusters and Complex Molecular Systems (www.begdb.com): A Users Manual and Examples

2008 ◽  
Vol 73 (10) ◽  
pp. 1261-1270 ◽  
Author(s):  
Jan Řezáč ◽  
Petr Jurečka ◽  
Kevin E. Riley ◽  
Jiří Černý ◽  
Haydee Valdes ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Molecular Clusters ◽  
Basis Set ◽  
Web Based ◽  
Molecular Systems ◽  
Complete Basis ◽  
Complete Basis Set ◽  
Complete Basis Set Limit

Our previous benchmark CCSD(T)/ complete basis set limit calculations were collected into a database named begdb - Benchmark Energy and Geometry DataBase. Web-based interface to this database was prepared and is available at www.begdb.com. Users can browse, search and plot the data online or download structures and energy tables.

From CCSD(T)/aug-cc-pVTZ-J to CCSD(T) complete basis set limit isotropic nuclear magnetic shieldings via affordable DFT/CBS calculations

2011 ◽  
Vol 49 (5) ◽  
pp. 231-236 ◽  
Author(s):  
Teobald Kupka ◽  
Michał Stachów ◽  
Marzena Nieradka ◽  
Jakub Kaminsky ◽  
Tadeusz Pluta ◽  
...  
Keyword(s):  
Basis Set ◽  
Complete Basis ◽  
Complete Basis Set ◽  
Complete Basis Set Limit ◽  
Nuclear Magnetic

scholarly journals Quantum Calculations to Estimate the Heat of Hydrogenation Theoretically

2020 ◽  
Author(s):  
Ali Amir Khairbek
Keyword(s):  
Unsaturated Hydrocarbon ◽  
Experimental Results ◽  
Basis Set ◽  
Good Linear ◽  
Complete Basis ◽  
Complete Basis Set ◽  
Complete Basis Set Limit ◽  
The Mean ◽  
Experimental Values ◽  
Linear Correlations

Standard enthalpies of hydrogenation of 29 unsaturated hydrocarbon compounds were calculated in the gas phase by CCSD(T) theory with complete basis set cc-pVXZ, where X = DZ, TZ, as well as by complete basis set limit extrapolation. Geometries of reactants and products were optimized at the M06-2X/6-31g(d) level. This M06-2X geometries were used in the CCSD(T)/cc-pVXZ//M06-2X/6-31g(d) and cc-pV(DT)Z extrapolation calculations. (MAD) the mean absolute deviations of the enthalpies of hydrogenation between the calculated and experimental results that range from 8.8 to 3.4 kJ mol−1 based on the Comparison between the calculation at CCSD(T) and experimental results. The MAD value has improved and decreased to 1.5 kJ mol−1 after using complete basis set limit extrapolation. The deviations of the experimental values are located inside the “chemical accuracy” (±1 kcal mol−1 ≈ ±4.2 kJ mol−1) as some results showed. A very good linear correlations between experimental and calculated enthalpies of hydro-genation have been obtained at CCSD(T)/cc-pVTZ//M06-2X/6-31g(d) level and CCSD(T)/cc-pV(DT)Z extrapolation levels (SD =2.11 and 2.12 kJ mol−1, respectively).

Machine-learned electron correlation model based on correlation energy density at complete basis set limit

2019 ◽  
Vol 151 (2) ◽  
pp. 024104 ◽  
Author(s):  
Takuro Nudejima ◽  
Yasuhiro Ikabata ◽  
Junji Seino ◽  
Takeshi Yoshikawa ◽  
Hiromi Nakai
Keyword(s):  
Energy Density ◽  
Electron Correlation ◽  
Correlation Energy ◽  
Basis Set ◽  
Correlation Model ◽  
Model Based ◽  
Complete Basis ◽  
Complete Basis Set ◽  
Complete Basis Set Limit

Extrapolating Unconverged GW Energies up to the Complete Basis Set Limit with Linear Regression

2020 ◽  
Vol 16 (7) ◽  
pp. 4399-4407
Author(s):  
Fabien Bruneval ◽  
Ivan Maliyov ◽  
Clovis Lapointe ◽  
Mihai-Cosmin Marinica
Keyword(s):  
Linear Regression ◽  
Basis Set ◽  
Complete Basis ◽  
Complete Basis Set ◽  
Complete Basis Set Limit
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