Infrared (IR) Spectroscopy

Aug 01, 2013
Special Issues
By Spectroscopy Editors
In these types of IR imaging, various factors contribute to the observed resolution. These factors are illustrated with images of materials with known structures.
Aug 01, 2013
Special Issues
By Spectroscopy Editors
Combined experimental and computational investigation methods are used to estimate the defect density on a rutile surface, indicating its catalytic activity.
Feb 01, 2013
Spectroscopy
By Spectroscopy Editors
Polystyrene film is useful for routine checking of FT-IR spectrometer performance, but variations in film thickness and scattering can cause large variations in the results.
Oct 16, 2012
Wavelength
By Spectroscopy Editors
Click here to view the complete Wavelength newsletter from October 16, 2012.
Oct 01, 2012
Spectroscopy
Fourier transform infrared (FT-IR) spectroscopic imaging is a highly versatile technique that can be applied to a wide range of systems. This article summarizes some of the recent efforts developing applications of FT-IR imaging for microfluidics. The main advantage of FT-IR imaging compared to traditional imaging methods is that it is a label-free imaging technique.
Sep 14, 2012
Wavelength
By Spectroscopy Editors
The well-established technique of Fourier transform infrared (FT-IR) spectroscopy offers analytical capabilities for diverse applications, and chemometrics and spectral interpretation software are important elements of the technique.
Aug 01, 2012
Special Issues
By Spectroscopy Editors
The micro attenuated total reflectance (ATR) chemical imaging of polymers, in particular polymer laminates, typically requires significant pressure to ensure good sample-to-ATR crystal contact. For thin cross-sectioned materials, ensuring structural rigidity against this pressure requires significant sample preparation, such as resin embedding, cutting, and polishing.
Aug 01, 2012
Special Issues
By Spectroscopy Editors
Self-assembled monolayers (SAMs) can be applied in a variety of technical areas. Infrared characterization of these materials is a challenge because of the low concentrations on the surfaces. This article reviews the sampling methods for characterization and presents data comparing the different approaches.
Aug 01, 2012
Special Issues
By Spectroscopy Editors
Infrared reflection spectroscopy is a tool that can be used to study coated plastics, but the spectra can show unexpected features. In this report, we calculate the specular reflectance for a flat surface of two different polymers as well as how their spectra change when the other polymer is added as a film with a thickness of up to 2.5 ?m. One of the unusual phenomena we observe is that "derivative"-shaped substrate bands invert in sign as the other polymer is added as a coating. We also show how the reflection of the surface changes and becomes polarized as the angle of incidence increases.
Aug 01, 2012
Special Issues
By Spectroscopy Editors
The beginning of the age of Fourier transform infrared (FT-IR) spectroscopy meant the availability of digital spectra and opened the possibility of using computers to compare a single spectrum against a reference database containing thousands of spectra, thereby allowing enormous efficiency gains in the comparison of unknown spectra to reference materials. Various algorithms can be used to create a hit quality index (HQI), which is a measure of how well the query spectrum compares against each reference spectrum.
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