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Furrier Transformate Infra Red Spetrometer

Instrument's name: TENSOR 37
Instrument use: FT-IR spectrometer

Technical specifications:

Spectral range: 7,500 to 370 cm-1 with standard KBr beamsplitter
Resolution: Better than 0.6 cm-1 (apodized)
Wavenumber accurancy: Better than 0,01 cm-1 @ 2,000 cm-1
Photometric accuracy: Better than 0,1% T
Detector: High sensitivity DLATGS with KBr window
Sample compartiment: 25,5 x 27 x 16 cm, sealed from main optics by KBr windows, purgable
Interferometer: High stability interferometer with ROCKSOLID permanent alignment
Scan Speed: 5 velocities; 1,6 - 25,5 mm/sec opd

      The TENSOR 37 is an advanced flexible benchtop FT-IR spectrometer designed for the routine lab as well as for demanding analytical laboratory applications. The instrument uses a permanently aligned ROCKSOLIDTM interferometer which ensures a high energy throughput and low polarization effects. Removable covers sealing the source, interferometer and the detector compartment provide easy access to the main optical components. Detector and source can be changed to adapt to specific experimental conditions. The TENSOR 37 allows the change of the beam-splitter in order to switch the spectral range.

      The instrument in standard configuration is equipped with an air cooled high emission IR source and a low noise DLATGS detector (Deuterated L-alpha-Alanine doped TriGlycine Sulphate) for wide spectral range and highest spectral sensitivity. The sample chamber is equipped with a QuickLock baseplate, that allows a quick and reproducible exchange and the automatic identification of accessories with QuickLock function. The sample chamber is separated from the interferometer and from the detector compartment by windows.

      Measurement methods available for the analysis of samples using IR spectroscopy are: transmission and ATR (attenuated total reflection). Transmission analysis requires some preparation of the sample to ensure that the sample is optically thin. - Golden Gate diamond ATR unit, bonded into a tungsten carbide mount, impermeable non-allowing the lenses system condensation, KRS5 lenses - applications: high absorptive samples, pellets & powders, refracting or opaque solids, simple & coated fibers, corrosive liquids, thermochemycal studies, air sensitive samples. ATR spectroscopy usually requires little to no sample preparation.

      Some of the more common sample preparation procesures are:
- Place a thin film of solution between two thin plates made of a transparent substrate (NaCl, KBr, etc.);
- Dissolve a sample powder into a spectrophotometrically pure solvent
and place the solution:
      - On a transparent substrate
      - In an IR liquid cell
- Grind a solid sample into fine particles and disperse it in a Nujol "mull" (mull = is a two phase mixture);
- Grind a solid sample into fine particles and press the powder into a very thin uniform wafer;
- Grind a solid sample into fine particles, then disperse the sample in a transparent powder (KBr, etc.) and press the powder mixture into a very thin disc.
- Fill an evacuated gas cell with a gas sample.

      The most commonly detected contaminant peaks are water and carbon dioxide. These are present in the air and so are present in the sample chamber when samples are analyzed.



Fig.1 Polyvinylpyrrolidone spectrum

Fig.2 Polymeric hybrid spectrum