State Selective Equation of Motion Coupled Cluster Theory: Some Preliminary Results
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A multireference variant of coupled cluster theory is described that applies to systems that can qualitatively be described by deleting two electrons from a closed shell determinant, for example biradicals, single bond breaking processes, or valence excited states.Abstract:
A multireference variant of coupled cluster theory is described that applies to systems that can qualitatively be described by deleting two electrons from a closed shell determinant, for example biradicals, single bond breaking processes, or valence excited states. The theory can be generalized to arbitrary open-shell systems and takes a form that is akin to equation-of-motion coupled cluster theory, but where all wave function parameters are explicitly optimized for the state of interest. The implementation of the present methods was accomplished in an automated fashion using the recently developed Automatic Program Generator (APG). We present benchmark results for the O 2 and F 2 molecules and investigate the behaviour of a number of closely related variants within the same general framework. Keywords: Multireference electronic structure; Coupled cluster; Electronically excited states; Automatic code generation. I. Introduction Single reference coupled cluster theory, [1,2] especially CCSD(T) [3,4], is a highly successful approach to describe the electronic structure of systems that are qualitatively reasonably well described by a single determinant (many closed-shell molecules and high-spin open-shell systems) [5-8]. Likewise coupled cluster response theory (CCLRT [9-11]) and its cousin equation-of-motion coupled cluster theory (EOM-CC [5,12]) are well suited to describe singly excited states and radicals. An important prerequisite for the applicability of the CC response approach is the presence of a nearby state that can serve as the reference in the parent state CCSD calculation. Most commonly the reference state is a closed-shell system that differs by up to one electron from the states of interest. Theread more
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Equation-of-Motion Coupled-Cluster Methods for Open-Shell and Electronically Excited Species: The Hitchhiker's Guide to Fock Space
TL;DR: This review provides a guide to established EOM methods illustrated by examples that demonstrate the types of target states currently accessible by EOM, and touches on some formal aspects of the theory and important current developments.
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NWChem: Past, present, and future
Edoardo Aprà,Eric J. Bylaska,W. A. de Jong,Niranjan Govind,Karol Kowalski,T. P. Straatsma,Marat Valiev,H. J. J. van Dam,Yuri Alexeev,J. Anchell,V. Anisimov,Fredy W. Aquino,Raymond Atta-Fynn,Jochen Autschbach,Nicholas P. Bauman,Jeffrey C. Becca,David E. Bernholdt,K. Bhaskaran-Nair,Stuart Bogatko,Piotr Borowski,Jeffery S. Boschen,Jiří Brabec,Adam Bruner,Emilie Cauet,Y. Chen,Gennady N. Chuev,Christopher J. Cramer,Jeff Daily,M. J. O. Deegan,Thom H. Dunning,Michel Dupuis,Kenneth G. Dyall,George I. Fann,Sean A. Fischer,Alexandr Fonari,Herbert A. Früchtl,Laura Gagliardi,Jorge Garza,Nitin A. Gawande,Soumen Ghosh,Kurt R. Glaesemann,Andreas W. Götz,Jeff R. Hammond,Volkhard Helms,Eric D. Hermes,Kimihiko Hirao,So Hirata,Mathias Jacquelin,Lasse Jensen,Benny G. Johnson,Hannes Jónsson,Ricky A. Kendall,Michael Klemm,Rika Kobayashi,V. Konkov,Sriram Krishnamoorthy,M. Krishnan,Zijing Lin,Roberto D. Lins,Rik J. Littlefield,Andrew J. Logsdail,Kenneth Lopata,Wan Yong Ma,Aleksandr V. Marenich,J. Martin del Campo,Daniel Mejía-Rodríguez,Justin E. Moore,Jonathan M. Mullin,Takahito Nakajima,Daniel R. Nascimento,Jeffrey A. Nichols,P. J. Nichols,J. Nieplocha,Alberto Otero-de-la-Roza,Bruce J. Palmer,Ajay Panyala,T. Pirojsirikul,Bo Peng,Roberto Peverati,Jiri Pittner,L. Pollack,Ryan M. Richard,P. Sadayappan,George C. Schatz,William A. Shelton,Daniel W. Silverstein,D. M. A. Smith,Thereza A. Soares,Duo Song,Marcel Swart,H. L. Taylor,G. S. Thomas,Vinod Tipparaju,Donald G. Truhlar,Kiril Tsemekhman,T. Van Voorhis,Álvaro Vázquez-Mayagoitia,Prakash Verma,Oreste Villa,Abhinav Vishnu,Konstantinos D. Vogiatzis,Dunyou Wang,John H. Weare,Mark J. Williamson,Theresa L. Windus,Krzysztof Wolinski,A. T. Wong,Qin Wu,Chan-Shan Yang,Q. Yu,Martin Zacharias,Zhiyong Zhang,Yan Zhao,Robert W. Harrison +113 more
TL;DR: The NWChem computational chemistry suite is reviewed, including its history, design principles, parallel tools, current capabilities, outreach, and outlook.
Journal ArticleDOI
NWChem: Past, Present, and Future
Edoardo Aprà,Eric J. Bylaska,W. A. de Jong,Niranjan Govind,Karol Kowalski,T. P. Straatsma,Marat Valiev,H. J. J. van Dam,Yuri Alexeev,James L. Anchell,Victor M. Anisimov,Fredy W. Aquino,Raymond Atta-Fynn,Jochen Autschbach,Nicholas P. Bauman,Jeffrey C. Becca,David E. Bernholdt,Kiran Bhaskaran-Nair,Stuart Bogatko,Piotr Borowski,Jeffrey Scott Boschen,Jiří Brabec,Adam Bruner,Emilie Cauet,Y. Chen,Gennady N. Chuev,Christopher J. Cramer,Jeff Daily,M. J. O. Deegan,Thomas Dunning,Michel Dupuis,Kenneth G. Dyall,George I. Fann,Sean A. Fischer,Alexandr Fonari,H. Früuchtl,Laura Gagliardi,Jorge Garza,Nitin A. Gawande,Sayan Ghosh,Kurt R. Glaesemann,Andreas W. Götz,Jeff R. Hammond,Volkhard Helms,Eric D. Hermes,Kimihiko Hirao,So Hirata,Mathias Jacquelin,Lasse Jensen,Benny G. Johnson,Hannes Jónsson,Ricky A. Kendall,Michael Klemm,Rika Kobayashi,V. Konkov,Sriram Krishnamoorthy,Manojkumar Krishnan,Zijing Lin,Roberto D. Lins,Rik J. Littlefield,Andrew J. Logsdail,Kenneth Lopata,Wan Yong Ma,Aleksandr V. Marenich,J. Martin del Campo,Daniel Mejía-Rodríguez,Justin E. Moore,Jonathan M. Mullin,Takahito Nakajima,Daniel R. Nascimento,Jeffrey A. Nichols,Patrick Nichols,J. Nieplocha,A. Otero de la Roza,Bruce J. Palmer,Ajay Panyala,T. Pirojsirikul,Bo Peng,Roberto Peverati,Jiri Pittner,L. Pollack,Ryan M. Richard,P. Sadayappan,George C. Schatz,William A. Shelton,Daniel W. Silverstein,Dayle M. A. Smith,Thereza A. Soares,Duo Song,Marcel Swart,H. L. Taylor,G. S. Thomas,Vinod Tipparaju,Donald G. Truhlar,Kiril Tsemekhman,T. Van Voorhis,Álvaro Vázquez-Mayagoitia,Prakash Verma,Oreste Villa,Abhinav Vishnu,Konstantinos D. Vogiatzis,Dunyou Wang,John H. Weare,Mark J. Williamson,T. L. Windus,Krzysztof Wolinski,A. T. Wong,Qin Wu,Chan-Shan Yang,Q. Yu,Martin Zacharias,Zhiyong Zhang,Yan Zhao,Robert W. Harrison +113 more
TL;DR: The NWChem computational chemistry suite as discussed by the authors provides tools to support and guide experimental efforts and for the prediction of atomistic and electronic properties by using first-principledriven methodologies to model complex chemical and materials processes.
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An orbital-invariant internally contracted multireference coupled cluster approach.
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Automatic code generation for many-body electronic structure methods: the tensor contraction engine‡‡
Alexander A. Auer,Gerald Baumgartner,David E. Bernholdt,Alina Bibireata,Venkatesh Choppella,Daniel Cociorva,Xiaoyang Gao,Robert W. Harrison,Sriram Krishnamoorthy,Sandhya Krishnan,Chi-Chung Lam,Qingda Lu,Marcel Nooijen,Russell M. Pitzer,J. Ramanujam,P. Sadayappan,Alexander Sibiryakov +16 more
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