atomic emission spectroscopy 

Initialism: AES
https://doi.org/10.1351/goldbook.08452
Measurement method of atomic spectroscopy for measuring the amount of a chemical element based on the measurement of the intensity of characteristic electromagnetic radiation emitted by atoms or molecules.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 713 [Terms] [Paper]