initial plasma radiation zone

in inductively-coupled plasma optical emission spectroscopy
https://doi.org/10.1351/goldbook.08495
Inductively-coupled plasma volume in inductively-coupled plasma optical emission spectroscopy where the analytically-relevant light emission begins to be observed.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 722 [Terms] [Paper]