Attenuated Total Reflectance Spectroscopy (ATR)

Brand : Perkin Elmer

Model : FTIR – Spectrum 400

Brief description:ATR is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation. ATR uses a property of total internal reflection resulting in an evanescent wave. A beam of infrared light is passed through the ATR crystal in such a way that it reflects at least once off the internal surface in contact with the sample. This reflection forms the evanescent wave which extends into the sample. The penetration depth into the sample is typically between 0.5 and 2 micrometres, with the exact value being determined by the wavelength of light, the angle of incidence and the indices of refraction for the ATR crystal and the medium being probed. The number of reflections may be varied by varying the angle of incidence. The beam is then collected by a detector as it exits the crystal. Most modern infrared spectrometers can be converted to characterise samples via ATR by mounting the ATR accessory in the spectrometer's sample compartment. One advantage of ATR-IR over transmission-IR, is the limited path length into the sample. This avoids the problem of strong attenuation of the IR signal in highly absorbing media, such as aqueous solutions.

• Sample volume: 10 mm standard cell = 2.5 to 4.0 mL, TrayCell = 0.7 to 10 μL, Nano Stick = 2 μL min.
• Wavelength range: 190 to 1,100 nm.
• Spectral bandwidth: 1 nm
• Light source: 20 W halogen lamp and deuterium lamp Built-in light source auto position adjustment
• Monochromator: LO-RAY-LIGH grade blazed holographic grating in Czerny-Turner mounting
• Detector: Silicon photodiode
• Sample compartment Internal dimensions: W 110 × D 250 × H 115 mm
• Distance between light beams: 100 mm
• Display: 24-bit color touch screen

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