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Electrostatic damping functions and the penetration energy.

Anthony J Stone¹

¹University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, United Kingdom. ajs1@cam.ac.uk

The Journal of Physical Chemistry. A

|May 31, 2011

Summary

This study explores damping functions to improve multipole expansion accuracy at short distances. The ab initio method provides a clear description of penetration energy corrections, enhancing computational chemistry models.

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Area of Science:

Computational chemistry
Theoretical physics

Background:

Multipole expansion is a standard method for describing interactions at longer distances.
Corrections are needed at short-range due to overlapping electron clouds and penetration effects.

Purpose of the Study:

To explore the use of damping functions for correcting multipole expansion at short-range.
To provide an ab initio description of penetration energy corrections.

Main Methods:

Determining damping functions as a linear combination of analytic functions of site separation.
Incorporating additional short-range terms with different angular dependence.

Main Results:

Developed a method for ab initio determination of damping functions.
Successfully described penetration energy corrections in a comprehensible form.

Conclusions:

The proposed approach offers a detailed and accessible ab initio description of short-range corrections to multipole expansions.
This method can improve the accuracy of molecular interaction calculations.