Lecture 15 Spectroscopy

Lecture 15 Spectroscopy - Spectroscopy B A Rowland...

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Spectroscopy B. A. Rowland 53750/53760 Overview of Molecular Spectroscopy Molecular spectroscopy is the use of electromagnetic radiation (EMR) to induce electrons to make quantum transitions. In the figure in my slides, I have presented the potential energy surface (PES) for some hypothetical molecule. There are two black curves in this diagram. The lower curve represents the ground electronic state of the molecule, while the upper curve represents some excited electronic state. The red lines in each PES represent quantum vibrational levels (remember that like energy, vibrations and rotations are also quantized). The blue lines represent quantum rotational levels. If we know the frequency of radiation needed to excite a molecule from its known electronic, vibrational, or rotational state then we can easily calculate the energy differences for those states. Spectroscopy is the use of certain types of EMR (UV-Vis for electronic—black curve to
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