Fourier Transform Infra Red

Characterisation Installation 5
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Though based on the same physical phenomena regarding the interaction between radiation and matter, today’s IR spectrometers have evolved in the way they irradiate the sample, replacing the former monochromators for interferometers, giving rise to the faster FT-IR spectroscopy.

Besides its classical application in chemical characterization, the use of infrared radiation has evolved giving rise to new techniques that go further:

VCD (Vibrational Circular Dichroism) is a technique that gives 3D information of molecules. It can be applied for determining the secondary structure of proteins and peptides, the purity of enantiomers and also their absolute configuration by comparison with previously reported data or with data obtained through theoretical simulations.

PM-IRRAS (Polarization Modulation-IR Reflection-Adsorption Spectroscopy) is a very useful technique for the analysis of ultrathin layers and coatings, monolayers and submonolayers and biomolecules, deposited on surfaces, especially for conductors (Au, Cu, Pd, alloys, etc). It allows for the study of not only the composition but also the organization, conformation and orientation of molecules on a given substrate. In addition, it is also useful for analysing phenomena affecting such surfaces, as could be corrosion processes. Thanks to the characteristics of this technique, samples can be measured without reference, giving rise to spectra free from atmospheric interferences such as carbon dioxide and water vapour

FT-IR Microscopy which allows for visible inspection of samples and the obtaining of FT-IR spectra by attaching a microscope with the appropriate optics to a FT-IR spectrometer. It is useful for performing chemical characterization in concrete points, with minimum spot sizes of 25-30 μm, and also for obtaining chemical mappings of larger areas.

          provided at NFFA-Europe laboratories by:

Bruker-Hyperion 3000 microscope @ Laboratory for Micro- and Nanotechnology

Fourier transform infrared spectroscopy

a: Halogen for the Near infrared

b: Globar: for the MidIR 

c: Synchrotron: MIR highest spatial resolution and opaque materials

a: 2000 cm-1 to 12000 cm-1 (800 nm to 5 µm)

b: 800 cm-1 to 6500 cm-1 (1.5 µm to 12.5 µm)

MCT photoconductor, AC modus. Other detectors (Bolometer, InSb, Ge) on request

Spectral: 0.5 cm-1; spatially (10 µm @ 2000cm-1, typically)

Scanning x, y

Solid, gaseous, 5x5mm2 tyically, can be larger or smaller if convenient. 4 K < 400 K

Optical inspection (low resolution: 2 µm typically)

Special objectives for attenuated total reflection as well as grazing incidence