Overview to infrared laboratory

Bruker IFS 120 HR Fourier tranform spectrometer is hearth of the instrument. It has been provided with two absorption cells biult in Oulu by the workshop of the department.

Most important data for the spectrometer:

• The very best resolutio due to the maximum optical path difference:  0.00085 cm^-1
• The best instrumental resolutio in practise:  0.00125 cm^-1 (aperture broadening included
• Possible working range 50 - 15792 cm^-1 (200-0.632 mm)
• Usable optical components limit the working range to 50-6300 cm-1 (200- 1.59 mm)
• In the range 50-800 cm^-1 a bolometer at 1.4-1.8 K:n made by Infrared Laboratories Inc. (USA)
• In the wavenumber range 800-2000 cm^-1 an MCT detector  (MCT = mercury-cadmium-telluride) is used. In the shorter wavelelnght range InSb (indium-antimone) detectors are used. MCT and InSb detectors have been made by Infrared Associates Inc.
• Internal precission < 0.000010 cm^-1. In good conditions can be as high. However, usually worse.
• Two White-type multi-reflection cells made by the Workshop of the Departmen can be utilized in the measurements. In the smaller (smaller figure) optimized cell absosrption path lenght can be 3.2 - 41.6 m. The volyme is 20 l. It is provided with gold mirrors. The mantle is stainless steel. The cell is controlled with a HeNe laser.
• in the bigger cell the maximum absortion path lenght is 200 m. The volymen is as high as 250 l. Therefore it not practical for exepnsive samples. This cell is also provided with gold mirrors.  It is controlled by a HeNe laser and alignment is motorized.