Photochemistry and Spectroscopy

Photochemistry is the study of chemical reactions resulting from the exposure of light radiations. Light supplies the required energy to take place the photochemical reactions. The visible and UV radiations (2000-8000Ǻ wavelength) are mainly used in photochemical reactions.


Grothaus-Draper Law (or) The Principle of Photochemical Activation:

Grotthus-Draper law states that only the light which is absorbed by a substance can

bring about a photochemical change.

However, the absorbed radiation does not necessarily cause a chemical reaction. When

the conditions are not favourable for the molecules to react, the light energy may be reemitted as heat or light or it remains unused.

spectroscopy deals with measuring and interpreting spectra that arise from the interaction of electromagnetic radiation (a form of energy propagated in the form of electromagnetic waves) with matter. It is concerned with the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules. Spectroscopy mostly useful for Astronemers.

  • Atoms in a hotter environment are excited to higher energy states. Their emissions start from higher energy levels. This gives astronomers information on the temperature of the object.
  • The continuous spectrum (blackbody radiation) of a star gives its temperature and colour. This enables astronomers to estimate its mass and life expectancy.


  • The greatest Scientific Exchange
  • Analytical and Bioanalytical methods
  • Atomic and Molecular Physics and Chemistry
  • Raman Spectroscopy
  • Infrared Spectroscopy

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