Spectroscopy

n. creation and observation of colors of a spectrum through a spectroscope

Spectroscopy is the study of the interaction between radiation (electromagnetic radiation, or light, as well as particle radiation) and matter. Spectrometry is the measurement of these interactions and an instrument which performs such measurements is a spectrometer or spectrograph. A plot of the interaction is referred to as a spectrum.
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Spec·tros·co·py n. The study of spectra, especially experimental observation of optical spectra. spec·tros co·pist n. [more]Spectroscopy - Community and Resources

Noun
1. the use of spectroscopes to analyze spectra
(synonym) spectrometry, spectroscopic analysis, spectrum analysis, spectrographic analysis
(hypernym) chemical analysis, qualitative analysis
(hyponym) mass spectroscopy

(n.)
The use of the spectroscope; investigations made with the spectroscope.