Abstract
An overview of recent advances in the experimental measurements, theoretical interpretations, and practical applications of bond length and bond angle changes that occur after a molecule absorbs one or more photons is presented. “Gentle” changes are those in which the chemical bonds remain intact, but the lengths and angles increase or decrease. The bond length and bond angle changes that occur when a molecule absorbs a photon are measured by using a combination of electronic (emission and absorption) spectroscopy, resonance Raman spectroscopy, and the time-dependent theory of spectroscopy. “Catastrophic” changes are those in which multiple bonds are broken, leading to extensive photofragmentation. Luminescence spectroscopy is used to identify the transient fragments of metal-containing compounds that are precursors for laser assisted chemical vapor deposition.
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