Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Tuesday 6th February 2018 from 11.00am to 11.15am (GMT).

During this time our website performance may be temporarily affected. If you have any questions please use the feedback button available under our menu button. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 4, 2018
Previous Article Next Article

A general spin-complete spin-flip configuration interaction method

Author affiliations

Abstract

A new, general spin-correct spin-flip configuration interaction (SF-CI) method is introduced by extending the occupation restricted multiple active spaces (ORMAS) CI method in GAMESS. SF-ORMAS is a single reference CI method that utilizes a high-spin restricted open shell determinant on which an arbitrary amount of spin-flipped excitations are carried out to generate a wave function of desired multiplicity. Furthermore, the SF-ORMAS method allows for a flexible design of the active space(s) to fit the chemical problem at hand. Therefore, a variety of spin-flip schemes can be implemented within this one formalism. As SF-ORMAS mostly accounts for static correlation, dynamic correlation is included through perturbation theory. The new method is demonstrated for single and multiple bond breaking, diradical systems, vertical excitations of linear alkenes, and the singlet–triplet energy gap of silicon trimer.

Graphical abstract: A general spin-complete spin-flip configuration interaction method

Back to tab navigation

Publication details

The article was received on 06 Oct 2017, accepted on 21 Dec 2017 and first published on 10 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP06837A
Citation: Phys. Chem. Chem. Phys., 2018,20, 2615-2626
  •   Request permissions

    A general spin-complete spin-flip configuration interaction method

    J. Mato and M. S. Gordon, Phys. Chem. Chem. Phys., 2018, 20, 2615
    DOI: 10.1039/C7CP06837A

Search articles by author

Spotlight

Advertisements