UV-Vis-NIR

Ultraviolet-Visible-near-IR Spectroscopy (UV-Vis-NIR)

Measurements in the ultraviolet/visible region (UV-VIS) cover wavelengths from about 200 nm to 800 nm. The absorption of ultraviolet or visible radiation by a molecule leads to transitions among the electronic energy levels of the molecule. It is ideal for characterizing the optical and electronic properties of various materials such as: films, powders, monolithic solids, and liquids.  The near-IR region (NIR) of the electromagnetic spectrum utilizes wavelengths from about 800-2500 nm. The transitions measured in this region are generally related to overtone and combination bands of mid-infrared vibrational modes.

Sample Requirements/Measurements

  • Solids, liquids, and powders can be measured with relative ease​
  • Sample size can vary from 2 x 2 mm up to several cm​
  • We can collect data in almost any modality: transmission, diffuse reflection, variable angle specular reflection, and variable angle transmission.​

Instrumentation

Perkin-Elmer Lambda 950 UV-Vis-NIR Spectrophotometer and Agilent/Cary 7000 with UMA​

User Policies, Procedures, and Training

Potential users are encouraged to contact the appropriate MCL staff member to discuss potential applications of this technique. If the technique is deemed appropriate, the user will be trained.