Introduction to Transient Absorption Spectroscopy
When a molecule absorbs a photon, it imparts energy to the molecule causing it to temporarily excite from the ground state to a higher electronic or vibrational energy level. Due to conservation of energy, absorption can only take place when the photon energy is precisely equal to the difference between the ground and excited states can the light be absorbed. Additionally, since there is a direct correlation between the number of molecules and the number of absorbed photons, it is relatively straight forward to determine the molecular density. As a result, absorption is one of the most commonly used spectroscopic techniques, particularly for concentration measurements.
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