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Brochure: GENESYS UV-Vis Spectrophotometer Accessories Product Literature

VISCOUSFTNIR|/content/dam/tfs/ATG/CAD/CAD Product Images/Molecular Spectroscopy/NIR/FTNIR Spectrometer Accessories/005486_2.eps Product Literature

Data Sheet: ConservatIR FTIR Reflection Accessory Product Literature

Smart iTX Accessory Product Literature

Flyer: Everest ATR Product Literature

Brochure: iD7 ATR Accessory for the Nicolet iS5 Spectrometer Product Literature

Universal Platform Sampling Accessory for the DXR SmartRaman Spectrometer Product Literature

Application Note: Analysis of Artists’ Pigments by Far-infrared Microspectroscopy Product Literature

What are some subtleties and scenarios in inorganic applications for Fourier Transform Infrared Spectroscopy (FTIR)? Product FAQ

Answer

Fourier Transform Infrared Spectroscopy (FTIR) responds to a change in dipole moment, regardless of whether it is organic or inorganic. Metal oxides, carbonates, and carbonyls are good examples. The basic equation states that the wavenumber is proportional to the square root of the spring constant (bond strength) and one over the square root of the reduced mass. Simply put, as mass of the atoms involved in the bond goes up, the wavenumber goes down. Many inorganics have peaks below 400cm-1, such as ferrocene, acetylferrocene and cadmium oxide. This necessitates the use of “far-IR” optics. Many forensics users have found far-IR useful in identifying paint chips, due to their inorganic content. There are several ATR accessories that now permit far-IR ATR (mostly monolithic diamond devices). The Thermo Scientific Nicolet iS50 FTIR Spectrometer was designed to make far-IR performance trivial with a built-in ATR as well. Ultimately, if you have further interest in this area, you need to speak with an FTIR sales person to understand the capabilities and limitations.

Answer Id:: E20635

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Technical Bulletin: Capabilities and Performance of theiD7 ATR Accessory Product Literature

Application Note: Capabilities and Performance of the Smart iTX Accessory Product Literature

Specification Sheet: Praying Mantis Diffuse Reflectance Accessory Product Literature

iD1H Heated Transmission Accessory Product Literature

Brochure: picoSpin Spectrometer Frequently Asked Questions Product Literature

What is the advantage of DRIFTS compared to ATR technique in Fourier Transform Infrared Spectroscopy (FTIR)? What is the difference? Product FAQ

Answer

DRIFTS is used in both mid-IR and near-IR. In the mid-IR, DRIFTS requires the sample be blended with diluents like KBr, with 3-10% sample. This is typically undesirable as the sample is now mixed. However, DRIFTS is heavily used in catalysis research where powdered material is exposed to high temperature, elevated pressures, and mixtures of reactant gases. Several accessory suppliers make devices specific for this. In the near-IR, DRIFTS is used without dilution through direct measurement - many hand-held probes exist allowing analysis through a container wall (like plastic bags) meaning the sample can be analyzed without touching or contaminating it.

ATR involves making contact with the sample by forcing it into contact with a crystal. ATR generally does not require dilution and works well with solids like credit cards or car bumpers which would be tough in DRIFTS. ATR has, for the most part, displaced DRIFTS in the mid-IR except in special cases, while DRIFTS remains a method of choice in the near-IR world.

Answer Id:: E20636

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