glow discharge source 

https://doi.org/10.1351/goldbook.08481
Component of an atomic emission spectrometer employing a glow electric discharge used in atomic emission spectroscopy for qualitative and quantitative analysis of solid materials.
Note:
Glow discharge allows volatilization as well as excitation of analytes and sample matrices.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 720 [Terms] [Paper]