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Photochemistry and Spectroscopy Department

Institute of Physical Chemistry, Polish Academy of Sciences

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           MULTIFUNCTIONAL SPECTROFLUORIMETRIC SYSTEM

The system serves to measure the fluorescence emission and excitation, phosphorescence and to measure anisotropies of these spectra. It consists of a number of separate, mutually fitting units, that can be aligned and joined in a required number and sequence on a common optical bank. All optical units are characterised by the same large aperture, f/3.
The system consists of the following devices:

- Monochromators
- Slit iluminators

- Light modulators
- Light collimating and light focusing systems

- Light polarising systems
- Thermostat castings for a sample.

 

The monochromators and the illuminator can work independently of the rest of the system.

 

Some examples:
A.     The prismatic double monochromator: This monochromator is composed of two silica glass prisms 70 mm wide and 60 mm high. During each measurement the spectrum is being scanned by means of a synchronous motor over a wavelength span from 200 to 600 nm. The original reading system displays the spectral width of a transmitted band depending on the current wavelength and the slit width of the monochromator.    Optical layout of the prismatic double monochromator
B.     The analogous monochromator with flint glass prisms: The spectral range of this monochromator is from 380 to 750 nm    
C.     The monochromator with two different holographic gratings 116 x 132 mm. The gratings can be alternatively inserted into the optical path. Depending on the grating the spectrum can be scanned by a synchronous motor in the spectral range 190–-600 nm (the grating with1800 grooves/mm) or in the range 350- 800 nm (the grating with 1200 grooves/mm). Linear dispersion is 1 nm per 1 mm of slit width for the former and 1.5 nm per 1 mm of slit width for the latter.    
D.     The grating monochromator with only one 166 x 132 mm holographic grating frequency (1200 grooves/mm). The spectral range of this monochromator is red-shifted towards 300 – 1200 nm.     
E.      The slit illuminator with a high pressure Xe or Hg burner. The optical system forms an image of the light source of the dimentions 1.5 x 15 mm and of the aperture adapted to the dimensions of the f/3 aperture of slit.    
F.      The low-temperature thermostat casting for the sample. As a cooling agent liquid N2 is used, flowing through a copper block in which the sample is positioned. The temperature of the sample can be adjusted in the range 80-240 K with the accuracy of +/-0.5 K. The current temperature is determined by means of the Pt thermoresistor.