Investigation of ultraweak emissions in the processes of chemiluminescence,CL,and electrochemiluminesce,ECL,requires special techniques of their recording and spectral analysis.From among the hitherto proposed methods of detection of the emission spectra of these processes,that of the cut-off filter was most sensitive.The usefulness of this method in interpretation of the CL and ECL systems of the quantum fields in the range 1×10-9-1×10-11 containing ions and complexes of Eu(Ⅲ),Tb(Ⅲ) and Dy(Ⅲ) was shown.Exceptional character of the emission bands of lanthanide ions,being a result of the f-f electron transitions and in particular their low FWHM,permitted the application of the cut-off filter method to their analysis.The results obtained for CL and ECL on the basis of analysis of ultraweak emission proved to be successful in analytical applications.The systems containing Eu(Ⅲ) ions hydrated or complexed with organic ligands enabled inferring changes in the coordination sphere of the ions.
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