1. Sample is dissolved in volatile solvent and injected through a fine hypodermic needle to give a fine mist.
2. Tip of needle is attached to positive terminal of a high - voltage power supply.
3. Particles are ionised : they gain a proton from the solvent as they leave the needle producing +ve ions
X(g) + H+ = XH+
4. The solvent evaporates while the XH+ ions are attracted towards a negative plate. Here they're accelerated.
- Useful for substances with a high formula mass
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