Sentence examples for * ccsd from inspiring English sources

On the other hand, the more advanced coupled-cluster with single and double CCSD and triple excitations CCSD(T) methods [43 46] are able to evaluate the dispersion interaction well.

However, the cpu-time of CCSD calculation reduces to 1/8 of CCSD(T) calculation (5.3 hours to 44.6 hours).

For example, the hierarchy of ab initio electron correlation methods MP2 (Møller-Plesset second-order perturbation theory), CCSD (coupled-cluster theory with single and double excitations) and CCSD(T) (CCSD with a perturbative treatment of triple excitations) provide a a route to converging reliably to high accuracy.

We report atomization energy differences between different sets of data obtained from accurate CCSD (T) calculations for diatomic molecules of first row atoms.

Aquarius implements a range of coupled-cluster and related methods such as CCSD and CCSDT by writing the equations on top of a C++ templated domain-specific language.

The investigated molecules include the three stable isomers of the C20 carbon cluster calculated at the CCSD level and the first three oligomers of the biphospholylidene dioxide and biphospholylidene disulfide polymer series, respectively, calculated at the CCSD (monomers) and MBPT(2) (all oligomers) levels.

We present a new diagnostic for open-shell coupled-cluster theory, readily computed from the single substitution amplitudes in the CCSD wavefunction.

Calibration of the D1 ROCCSD) diagnostic on 34 molecular systems indicates that for values of D1 ROCCSD) of 0.025 or below the quality of the CCSD results are, in general, excellent, whereas values larger than 0.025 signal inadequacies in the CCSD approach.

However, the cpu-time of CCSD (T) is much longer than that of the CCSD.

The more advanced CI method CCSD (T) gives better results than that of the CCSD method.

However, large basis set remarkably increases the cpu-time of CCSD (T) calculations.