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Combined complete active space configuration interaction and perturbation theory applied to conformational energy prototypes: Rotation and inversion barriers

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dc.contributor.author Sinha Ray, Suvonil
dc.contributor.author Mahapatra, U. S
dc.contributor.author Chaudhuri, R. K
dc.contributor.author Chattopadhyay, S
dc.date.accessioned 2020-11-17T14:25:44Z
dc.date.available 2020-11-17T14:25:44Z
dc.date.issued 2017-11
dc.identifier.citation Computational and Theoretical Chemistry, Vol. 1120, pp. 56-78 en_US
dc.identifier.issn 2210-271X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7155
dc.description Restricted Access © Elsevier B.V. https://doi.org/10.1016/j.comptc.2017.10.003 en_US
dc.description.abstract A second-order multireference perturbation theory, termed as IVO-SSMRPT which allows the use of CASCI reference wave functions with improved virtual orbitals (IVO) for capturing static correlation and state-specific parameterization of the state-universal electronic wave function in an attempt to account for dynamic correlation has been utilized in an investigation of the torsional properties of ethylene, silaethylene, hydrogen peroxide, hydrazine, and oxalyl chloride. We also calculate the barrier to inversion of ammonia. IVO-SSMRPT is robust and useful to scan energy surfaces as it avoids the intruder-state problem, a troubling aspect of various established MRPT methods, without exploiting level-shifting or increasing the size of the active space. We find that IVO-SSMRPT with the use of a relatively small active space and basis set can be compared with recent reference estimates which are reproduced within the expected precision indicating the method is useful for the study of rotation and inversion barriers of challenging molecules. en_US
dc.language.iso en en_US
dc.publisher Elsevier B.V en_US
dc.subject Multireference perturbation theory en_US
dc.subject Improved virtual orbitals en_US
dc.subject State-specific method en_US
dc.subject Torsional/Inversion surfaces en_US
dc.subject Barrier height en_US
dc.title Combined complete active space configuration interaction and perturbation theory applied to conformational energy prototypes: Rotation and inversion barriers en_US
dc.type Article en_US


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