CHEM 151 Lecture 2: CHEM 151 U2M1 Notes
29 Sep 2016
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Central goal: to use absorption and emission spectra to derive information about the structure of matter. Much of what we know about the structure of atoms and molecules is derived from the analysis of the interaction of light, electromagnetic (em) radiation, with the substance of interest. In most cases, we analyze the type and amount of em radiation that the substance either absorbs or emits when heated. The different types of em radiation are characterized by their wavelength (), frequency (v) or energy (e) (given one, we can calculate the other two). C = speed of light = 3. 00 x 108 m/s. The distinction between different types of em radiation is relevant in chemistry because chemical substates interact in distinctive manners with different types of radiation. Atoms and molecules interact with em radiation because they are made up of charged particles (electrons and protons).
