Photochemistry and Spectroscopy Department

Institute of Physical Chemistry, Polish Academy of Sciences


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.