Spin contamination-free N-electron wave functions in the excitation-based configuration interaction treatment

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Spin-contamination of coupled-cluster wave functions

The propensity of approximate solutions of the electronic Schrödinger equation to break spin-symmetry is directly related to the quality of the approximate wave function, and thus can be used as a diagnostic tool. The quasi-variational nature of the ~valence! optimized orbitals coupled-cluster doubles methods, ~V!OO-CCD, enables a discussion of the stability of coupled-cluster wave functions in...

متن کامل

Spin contamination in quantum Monte Carlo wave functions

The wave function usually employed in quantum Monte Carlo ~QMC! electronic structure calculations is the product of a Jastrow factor and a sum of products of up-spin and down-spin determinants. Typically, a different Jastrow factor is used for paralleland antiparallel-spin electrons in order to satisfy the cusp conditions and thereby ensure that the local energy at electron– electron coincidenc...

متن کامل

Seniority number in spin-adapted spaces and compactness of configuration interaction wave functions.

This work extends the concept of seniority number, which has been widely used for classifying N-electron Slater determinants, to wave functions of N electrons and spin S, as well as to N-electron spin-adapted Hilbert spaces. We propose a spin-free formulation of the seniority number operator and perform a study on the behavior of the expectation values of this operator under transformations of ...

متن کامل

Pseudospectral double excitation configuration interaction

Recently, we have presented’ a pseudospectral formulation of the full configuration interaction (FCI) problem. The method was accurate to a mhartree after corrections, but the size of the numerical grids required made it impossible to realize any computational advantage for systems feasible with today’s hardware. In this paper, we present the first application of the pseudospectral method to tr...

متن کامل

Configuration interaction wave functions: a seniority number approach.

This work deals with the configuration interaction method when an N-electron Hamiltonian is projected on Slater determinants which are classified according to their seniority number values. We study the spin features of the wave functions and the size of the matrices required to formulate states of any spin symmetry within this treatment. Correlation energies associated with the wave functions ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: The Journal of Chemical Physics

سال: 2016

ISSN: 0021-9606,1089-7690

DOI: 10.1063/1.4955159