IR/NIR/FT-Raman measurement using a broadband KBr Beam Splitter

IR (Mid-IR), NIR, and Raman spectroscopy are widely used for qualitative and quantitative analysis of polymer, food, medicine, semiconductor material, etc., while if those methods are properly combined, it is possible to obtain more information on basic physical property of the sample. As an example, if IR and NIR spectroscopy are combined, the following information can be obtained.

• Dissociation energy of molecule (De)
• Absorption index in the IR and NIR region (α)
• Optical constant (n, k)

These values can provide the important perception for prediction of the chemical reaction or design of various devices. Additionally if IR and Raman spectroscopy are combined, the following information can be obtained.

• Complementary information on molecular vibration
• Information on lattice vibration by measurement in low wavenumber range (specific to Raman spectroscopy)
• Information on molecular vibration when combined with heavy atom

FTIR instrument can measure the IR/Near IR/Far IR spectrum by selecting the proper light source, detector, and B/S, and if the FT-Raman system is used, can obtain the Raman spectrum also. The measurement range covered by general B/S used in FTIR is from 7800 to 375 cm-1, dedicated to IR range, while broadband KBr B/S covers the range from 12000 to 375 cm-1, enabling the measurement of IR/NIR/Raman spectrum without replacing the B/S.

This application data shows the perception of the basic physical property of chloroform by measuring the IR/NIR/Raman spectrum using broadband KBr B/S.