Multicenter integrals involving complex Gaussian type functions

Abstract

Multicentric integrals that involve a continuum state cannot be evaluated with the usual quantum chemistry tools and require a special treatment. We consider an initial molecular bound state described by multicenter spherical or cartesian Gaussian functions. An electron ejected through an ionization process will be described by an oscillating continuum wavefunction that enters the matrix element necessary for cross section calculations. Within a monocentric approach, we have recently shown how such integrals can be evaluated analytically by using a representation of the continuum state by a set of complex Gaussian functions. In this work we tackle the multicentric situation. The method, developed in either spherical or cartesian coordinates, and validated by numerical tests, makes use of existing mathematical tools extended to the complex plane.

20 pages, 2 figures

References in corpus (2)

• Fitting continuum wavefunctions with complex Gaussians: Computation of ionization cross sections
• A complex Gaussian approach to molecular photoionization

Cited by in corpus (3)

• On the use of complex GTOs for the evaluation of radial integrals involving oscillating functions
• Free-particle Green's function matrix elements over spherical Gaussian and plane-wave-modulated Gaussian basis functions
• A complex Gaussian representation of continuum wavefunctions respectful of their asymptotic behaviour