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measures transitions between the electronic energy levels of (metal) atoms

Spectroscopy normally implies that a spectrum of absorption or emission versus
wavelength (or frequency) is obtained at a fixed concentration.

Spectrometry usually measures absorption (or emission) at a single wavelength (frequency) over a range of concentrations.

- turns the sample into atoms and measures photons emitted or absorbedas a result of transition of an electron between energy levels

atomic emission - creates colours when metallic salts are burned in flames
flame photometry - samples dissolved in a solvent are volatilised and sprayed into a flame.
                             - depends on being able to create a significant population in the excited states
                             - difficult at flame temperatures.
                             - widely used in the analysis of blood found coupled with more complicated                                             excitation sources such as plasmas