Glow-discharge optical emission spectroscopy (GD-OES) is an analytical technique used for the elemental analysis of solid materials. It combines two main processes: glow discharge and optical emission spectroscopy. Here's a brief overview of how it works and its applications: ### How It Works 1. **Glow Discharge**: - A glow discharge is established between two electrodes in a low-pressure gas (such as argon).
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