Encyclopedia of Geochemistry

2018 Edition
| Editors: William M. White

Ab Initio Calculations

  • David A. DixonEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-39312-4_16

Definition

Molecular orbital theory is an approach to solving the Schrödinger equation for the motion of electrons in molecules (as well as atoms). Such calculations are known as ab initio (from first principles) electronic structure calculations. The molecular orbitals are usually expressed as sums of atomic orbitals, and the rules of quantum mechanics including the Pauli exclusion principle are followed. The use of molecular orbital theory ranges from qualitative where it is used to provide a description of the electron occupancy in a molecule to explain experimental results from photoelectron spectroscopy and electronic spectroscopy to extremely quantitative with a focus on precise predictions of molecular energetics and spectroscopic parameters.

Overview

Molecules contain electrons which have a low enough mass that the laws of quantum mechanics must be used to describe them if the electronic structure of an atom or molecule needs to be studied. In order to predict the energy of the...

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of AlabamaTuscaloosaUSA