Full set of Notes with Fill-Ins - San Jose State University

Chem 155 Unit 9 Atomic Emission Page 164 of 316Types of AES:1.1.54 PLASMAPlasma is ionized gas – typically Ar, Ar + , e -Ionization is maintained in one of three ways:• A DC electrical discharge called “Direct CurrentPlasma”, DCP or Plasma Jet• An induction coil operating at 27 or 41 MHz“Inductively Coupled Plasma” , ICP• A Microwave Cavity called Microwave InducedPlasma or MIP1.1.55 FLAME• Flame Emission Spectrometry or “FES”• Flame is “chemical plasma” – typicallycomprising CO 2 , H 2 O, other Molecules, e - e -• Flame types include: Air - C 2 H 2 , N 2 O - C 2 H 2 ,O 2 – C 2 H 2• FES is limited to easily excited species such asNa, Li, K1.1.56 ARC / SPARK• Arc = Continuous Discharge• Spark = Pulsed Discharge• These two are like DCP, but are done in air, onsolids (e.g. pressed powders) or metalsurfacesPage 164 of 316