Accepted Manuscript Extended Random Phase Approximation method for atomic excitation energies from correlated and variationally optimized second-order density matrices Helen van Aggelen, Brecht Verstichel, Guillaume Acke, Matthias Degroote, Patrick Bultinck, Paul W. Ayers, Dimitri Van Neck PII: S2210-271X(12)00544-0 DOI: http://dx.doi.org/10.1016/j.comptc.2012.09.036 Reference: COMPTC 933 To appear in: Computational & Theoretical Chemistry Received Date: 23 July 2012 Revised Date: 25 September 2012 Accepted Date: 26 September 2012 Please cite this article as: H. van Aggelen, B. Verstichel, G. Acke, M. Degroote, P. Bultinck, P.W. Ayers, D. Van Neck, Extended Random Phase Approximation method for atomic excitation energies from correlated and variationally optimized second-order density matrices, Computational & Theoretical Chemistry (2012), doi: http:// dx.doi.org/10.1016/j.comptc.2012.09.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.