Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSinha Ray, Suvonil-
dc.contributor.authorMahapatra, U. S-
dc.contributor.authorChaudhuri, R. K-
dc.contributor.authorChattopadhyay, S-
dc.identifier.citationComputational and Theoretical Chemistry, Vol. 1120, pp. 56-78en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractA 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.publisherElsevier B.Ven_US
dc.rights© Elsevier B.V.-
dc.subjectMultireference perturbation theoryen_US
dc.subjectImproved virtual orbitalsen_US
dc.subjectState-specific methoden_US
dc.subjectTorsional/Inversion surfacesen_US
dc.subjectBarrier heighten_US
dc.titleCombined complete active space configuration interaction and perturbation theory applied to conformational energy prototypes: Rotation and inversion barriersen_US
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
Combined complete active space configuration.pdfRestricted Access2.08 MBAdobe PDFView/Open    Request a copy

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.