Chemistry 2214A/B Lecture Notes - Lecture 29: Molecule, Triatomic Molecule, Diatomic Molecule
29 Jan 2015
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Energy position: energy of the transition characteristic of a molecule. Line width: related to the lifetime of the excited state via heisenberg"s uncertainty principle: e. Intensity: dipole (transition matrix elements) and the availability of the final state, e. g. d0 to d10 in transition metals. The magnitude of the integrated absorption coefficient depends on a quantity called the transition dipole moment, . The idea is that, for the molecule to be able to interact with the electromagnetic field and absorb or create a photon of frequency , it must possess, at least transiently, a dipole oscillating at that frequency. A free atom traveling in space can be tracked by its coordinates (x, y, z). Thus, a free atom is said to have three degrees of freedom in its translational motion. A diatomic molecule traveling in space can be tracked by the coordinates (x, y, z) of its centre of gravity.
