Electronic configuration of an atom containing an electronic vacancy that can be present during processes, such as Auger electron and
X-ray photoelectron emission, but is not created or destroyed in the process.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1830 (https://doi.org/10.1515/pac-2019-0404)