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Sulsa and Chips
Department of Chemistry
Colorado State University
Fort Collins, CO 80523
FAX: (970) 491-1801

UV-VIS-NIR Spectroscopy

The UV/visible EM radiation causes electronic transitions within a molecule, promoting bonding and non-bonding electrons to higher, less stable antibonding orbitals. The molecule then loses this excess energy by rotation and vibrational relaxation

Cary 500 UV-VIS-NIR (Ultra violet– visible-near infrared) spectrophotometer is used for optical absorbance and reflectance measurements in the wavelength range (175-3300 nm).

In principle the technique is similar to IR-absorbance i.e. when a sample of an unknown compound is exposed to light, certain functional groups within the molecule absorb light of different wavelengths in the UV or visible or NIR region. UV-VIS-NIR spectroscopy is used for qualitative and quantitative analysis of materials.

Cary 500 is equipped with following accessories:

 

Variable Angle Specular Reflectance Accessory (VASRA) uses of the extended sample compartment accessory. VASRA is available for specular reflectance measurements of thin films at angles between 20 degrees and 70 degrees with angle settings in 0.5-degree increments

Praying Mantis is the diffuse reflectance accessory used for easy and reliable diffuse reflection analysis of solids and powders, in the wavelength range of 185 to 3300 nm fluorescence

Click here for more information and links for UV-VIS NIR Spectroscopy

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