Infrared Spectroscopy (FTIR) Analytical Capabilities
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Identifies chemical bond functional groups by the absorption of infrared radiation which excites vibrational modes in the bond
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May be used in transmission mode
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In attenuated total reflectance (ATR) mode, the detection depth is generally 1-2μm deep, but can be much more or less dependent upon the material. Black, absorbing materials tend to be less
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Especially capable of identifying the chemical bonds of organic materials
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Detects and Identifies organic contaminants
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Identifies water, phosphates, sulfates, nitrates, nitrites, and ammonium ions
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Detection limits vary greatly, but are sometimes <1013 bonds/cm3 or sometimes sub monolayer
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Useful with solids, liquids, or gases
FTIR Spectroscopy System Capabilities
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In transmission mode, area of analysis is about 1mm x 1mm. Liquid layer thickness may be from sub-micrometer to a few millimeters. The sample lateral dimensions may be at least 12in x 12in
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Using the Specac Golden Gate ATR, the area analyzed is about 0.6 mm x 0.6mm. The thickness may be from sub-micrometer to a few millimeters. The width of a sample must be less than 83mm or about 3½ inches. The window is a rugged type IIa diamond. Pressure is applied on the sample at a uniform setting of 80lbs. by a sapphire anvil
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Using the Pike Technologies Veemax II variable angle specular reflectance accessory, the sample may be many centimeters thick. The surface should be flat and relatively smooth. Sample widths must be less than 196mm or about 7¾ inches. This accessory is primarily useful for coatings on metal surfaces or polymer films on semiconductor wafer surfaces
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The spectral range is from 7800cm-1 to 350cm-1
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Resolution up to ½ cm-1
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Signal-to-noise ratio greater than 42000:1
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Temperature controlled DLATGS detector
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62° Michelson interferometer with retro-reflecting corner cube mirrors
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KRS-5 interferometer and DTGS detector windows
FTIR Spectra Databases
While chemical bond type identifications can be very useful for identifying strange and unusual material compositions, it is very useful to have large databases of FTIR spectra when one wants to match a particular substance to various specific manufactured products. Even when a particular material does not precisely match a manufactured material in a database, it is often helpful to know what products are similar to it. We presently have the following materials databases to assist us in these identifications:
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Fiveash Data Management FTIR Databases (24,470 Total Spectra)
Polymers and Polymer Additives (580 Spectra)
Surfactants (430 Spectra)
Organic Compounds Important to Industrial Processes (950 Spectra)
Minerals and Inorganic Compounds (310 Spectra)
Drugs and the Canadian Forensic Laboratory Spectra (3,750 Spectra)
Vapor Phase Spectra of Organic Compounds (5,220 Spectra)
Comprehensive Organic Compounds (10,300 Spectra)
Polymer, Plasticizer, and Monomer ATR FTIR Spectra (800 Spectra)
Essential Oil and Food Oil ATR FTIR Spectra (430 Spectra)
Inorganic Compound ATR FTIR Spectra (400 Spectra)
Dye, Stain, and Pigment ATR FTIR Spectra (170 Spectra)
Pharmaceuticals and Illicit Drug ATR FTIR Spectra (440 Spectra)
Adhesive and Sealant ATR FTIR Spectra (180 Spectra)
Cosmetic and Personal Care Product ATR FTIR Spectra (570 Spectra)
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JASCO compound database of 900 compounds with emphasis on polymers
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Know It All JASCO Edition compound database with 10,000 compounds with a per use fee to obtain matching spectra
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AME, Inc. Compiled Compound Database
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