The Difference Between Raman Spectrometer And Infrared Spectrometer?
"Raman spectrometer" and "Infrared spectrometer" are common instruments in material analysis and testing. The two instruments have some different factors in the functions and usage methods. We can learn the difference between these two instruments from the following table.
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Features
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Raman Spectrometer | Infrared Spectrometer |
| Principle | Comes from the scattering of light by the vibrating molecules. | The result of absorption of light by vibrating molecules. |
| Vibration in molecules | Causes the change in polarisability. | The change in dipole moment during the vibration. |
| Consideration of vibration | The molecule need not possess a permanent dipole moment. | There is a change in dipole moment, due to that vibration. |
| Solvent | Water can be the solvent of samples. | Water is not a suitable solvent, because of its intense absorption. |
| Sample Preparation | Sample preparation is not very important, Raman Spectrometer can accept almost all the states. | More complicated in sample preparation, and the gaseous sample is rare. |
| Results | Result of covalent character in the molecule. | Result of the ionic character in the molecule. |
| Cost | High | Economic |
From the above comparison results, we can understand the advantages and disadvantages of these two instruments, a Raman Spectrometer and an Infrared Spectrometer.
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