Infrared Spectroscopy: Vibrations and Selection Rules

This lecture covers the principles of infrared spectroscopy, focusing on vibrational transitions in molecules. It explains the quantized harmonic oscillator model, selection rules for absorption, and the relationship between dipole moments and transition visibility. The instructor discusses the energy levels of molecules, the concept of overtones, and the realistic model of energy spacing. Various examples and applications in laser micro-processing are presented, highlighting the importance of vibrational frequencies and dipole changes in the interaction with light.