# 1s Slater-type function

A normalized 1s Slater-type function is a function which is used in the descriptions of atoms and in a broader way in the description of atoms in molecules. It is particularly important as the accurate quantum theory description of the smallest free atom, hydrogen. It has the form It is a particular case of a Slater-type orbital (STO) in which the principal quantum number n is 1. The parameter is called the Slater orbital exponent. Related sets of functions can be used to construct STO-nG basis sets which are used in quantum chemistry. (Wikipedia).

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## Related pages

Hartree | Dirac equation | Atomic number | Electron