C.V. Raman (1888. 11. 7 – 1970. 11. 21):  An Indian physicist. He carried out ground-breaking work in the field of light scattering, which earned him the 1930 Nobel Prize for Physics. He discovered that when light interacts with a material, some of the scattered light changes wavelength. This phenomenon, subsequently known as Raman scattering, results from the Raman effect.

Principle of Raman spectroscopy

Raman scattering is a phenomenon in which a single frequency photon scatteres inelastically from the vibrational, rotational, or other low-lying excited states of the interacting material. This results in the change of the original friquency of the photon. Raman scattered light is mixed with photons of frequencies different from the original light. The difference between the initial frequency of the light source and the later frequency after interaction with the material is represented by the Raman spectrum. Since the Raman spectrum is unique for each material, it is used to identify unknown materials. In addition, physical and chemical changes in substances can be observed through analysis on the Raman spectrum.

A laser is used as a single frequency light. A combination of various optical elements and a microscope, spectrometer, and photodetector forms a micro Raman spectroscopy system that can measure even very small samples.

Principle of Raman scattering

Raman_energy_levels.svg.png

Schematic diagram of Raman system

Advantages of Raman spectroscopy

 

  • Non-destructive measurement

  • ​Identifying unknown materials

  • ​Samples in gas, liquid, and solid states can be measured.

  • Pretreatment of samples is not required in most cases

  • Samples of very tiny size are measurable (spatial resolution of ~ μm with micro-Raman system)

  • Hardly affected by moisture.

Raman Experiment Techniques

 

  • Spontaneous Raman spectroscopy

  • Resonant Raman spectroscopy

  • ​Polarization dependent Raman spectroscopy

  • Surface enhanced Raman spectroscopy

  • Imaging byRaman mapping

  • Temperature dependent Raman spectroscopy

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