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Infrared Spectroscopy and Raman Spectroscopy

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Differences between Infrared Spectroscopy and Raman Spectroscopy

Infrared Spectroscopy


Samples are irradiated with infrared light to measure how much light is transmitted through the sample and how much is reflected.

Raman Spectroscopy


Samples are irradiated with laser light to measure the amount of Raman scattering that occurs from the sample.

Virtual Excitation State

Enables Acquisition of Mutually
Complementary Molecular Information

Infrared and Raman Spectra of Polyester
(Laser Wavelength: 532 nm)

Infrared Spectroscopy is Better-Suited Raman Spectroscopy is Better-Suited
Polar bonds
O-H, N-H, C=O, C-O-C		 Non-polar bonds
C=C, S-S, C-S
Infrared and Raman Spectrum
 

Infrared Spectroscopy

Applicable components: Plastics, organic food components, and some inorganic components

 

Features

  • Widely used, resulting in plentiful application examples
  • Extensive spectral libraries available
  • Rarely damages samples
  • ATR (optional), transmission, or reflection methods can be selected depending on the sample

Raman Spectroscopy

Applicable components: Carbon materials (CNT, DLC, diamond, etc.), pigments, additives and other inorganic substances, and some organic substances


Features

  • Especially well-suited for analyzing carbon materials (carbon nanotubes, diamond, etc.)
  • Enables analysis in the depth direction
  • Transparent materials (glass, etc.) do not absorb visible laser light, so samples can be measured directly in containers
  • High spatial resolution (extremely small areas can be targeted)

Technical Information

Analysis Basics

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