{"term":{"id":"06998","title":"basis function","longtitle":"IUPAC Gold Book - basis function","doi":"10.1351\/goldbook.BT06998","code":"BT06998","status":"current","definitions":[{"id":1,"text":"A one-electron function used in the expansion of the molecular orbital function. Basis functions are commonly represented by atomic orbitals (see also Slater-type orbital or Gaussian-type orbital) centered on each atom of the molecule.","links":[{"term":"Slater-type orbital","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/S05710"},{"term":"molecular orbital","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/M03996"}],"sources":["PAC, 1999, 71, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1925 (https:\/\/doi.org\/10.1351\/pac199971101919)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/BT06998\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/BT06998\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/BT06998\/plain"},"citation":"Citation: 'basis function' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351\/goldbook.BT06998","license":"The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/) for individual terms.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2026-05-06T21:34:53+00:00"}}