# Electronic structure

In quantum chemistry, ( Science ) , **electronic structure** is the state of motion of electrons in an electrostatic field created by stationary nuclei.^{[1]} The term encompass both the wave functions of the electrons and the energies associated with them. Electronic structure is obtained by solving quantum mechanical equations for the aforementioned clamped-nuclei problem.

Electronic structure problems arise from the Born–Oppenheimer approximation. Along with nuclear dynamics problem, electronic structure problem is one of the two steps to study quantum mechanical motion of a molecular system. Except for a small number of simple problems such as hydrogen-like atoms, the solution of electronic structure problems require modern computers.

Electronic structure problem is routinely solved with quantum chemistry computer programs. Electronic structure calculations rank among the most computationally intensive tasks in all scientific calculations. For this reason, quantum chemistry calculations take up significant shares on many scientific supercomputer facilities.

A number of methods to obtain electronic structures exist and their applicability varies from case to case.^{[2]}

## See also

- Born–Oppenheimer approximation
- Molecular Hamiltonian
- Schrödinger equation
- Quantum chemistry computer programs

## References

- ↑ Simons, Jack (2003). "Chapter 6. Electronic Structures".
*An introduction to theoretical chemistry*(PDF). Cambridge, UK: Cambridge University Press. ISBN 0521823609. - ↑ H. F. Schaefer; et al. (1995). "1. The chemical applicability of standard methods in
*ab initio*molecular quantum mechanics". In Yarkony, David R.*Modern Electronic Structure Theory*. Singapore: World Scientific. p. 3. ISBN 978-9810229870.