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MCT detector and ATR FTIR spectroscopy accessories.
Photo: Andras Gorzsas
The MIRacle-ATR-unit (Pike Tech) has the following specifications: QuickLock mouting mechanism, Diamond/ZnSe composite crystals (single bounce), operating in the spectral range of 500-20,000 1/cm. The crystal plates are exchangeable, beam path purgeable and sealed.
The Platinum-ATR-accessory (Bruker) has the following specifications: Diamond crystal, single reflection, edged in tungsten carbide. The work disk is made of stainless steel. The spectral range covered is: 10-7,800 1/cm. The accessory allows for pressure control and has a working distance (max. sample height) of >20mm.
It also features exchangeable crystal plates (Diamond, Ge) and QuickLock mounting. The beam path is purgeable and sealed.
The MCT detector is liquid N2 cooled and broadband, with a spectral range of 420-12,000 1/cm. It has a typical hold time of ca. 8h and features an integrated amplifier and digitizing electronics.
The ATR accessories enable fast and reliable FT-IR-analysis of solids and liquids without sample preparation. They are mounted in a high end vacuum bench spectrometer (Vertex 80v), allowing high speed (over 100 spectra / s) and high spectral resolution (up to 0.06 1/cm) with excellent long term stability and no atmospheric interference. The added MCT detector increases sensitivity.
The sample is simply placed on top of the ATR crystal. In case of solids, pressure must be applied (in form of a clamp) to ensure optimal contact between the sample and the ATR crystal. In case of liquids, a cover lid may be used to protect the sample from evaporation under vacuum conditions inside the spectrometer. The incident lights angle is set so that at the interface of the high refraction ATR crystal and the sample an evanescent wave is created that penetrates into the sample and interacts with it. This interaction results in absorption at wavelengths / energies that are informative of the chemical functional groups building up the sample. The penetration depth is dependent on the sample, the wavelength of the light and the ATR crystal material as well as the quality of contact between them.
The instrument is placed in the Chemistry building, 6th floor, KB.C6 (B6.31.07).
"The instrument is can be run by anyone with a valid license. Courses for acquiring such license are held regularly (twice a year). See http://www.kbc.umu.se/english/visp/visp-courses/.Booking of the instruments can be done online with a valid license at the following link:http://www.kbc.umu.se/english/visp/booking/
These accessories only work in the Vertex 80v spectrometer.