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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/024/01/0176-0181

    • Keywords

       

      Exciting Radiation; Copper Sulphate; Photographic Plate; Normal Configuration; Fluorescence Line

    • Abstract

       

      Arguments are adduced to show that the doublet centred at 4152 Å occurring in the spectrum of all fluorescing diamonds arises from ‘forbidden’ transitions analogous to the forbidden3P-1S transitions in the spectrum of C I. On the basis of this analogy, fluorescence lines are also expected to occur at about 8816 Å and 7849 Å, analogous to the3P-1D and1D-1S transitions in C I. Of these, the former should also occur in absorption, while the latter should not occur in absorption and should be emitted only if the exciting radiation has a wavelength shorter than 4152 Å. A line has actually been found at 7930 Å, satisfying the latter conditions. The former line could not be recorded being outside the limit of sensitivity of the photographic plate.

    • Author Affiliations

       

      G N Ramachandran1 V Chandrasekharan1

      1. Department of Physics, Indian Institute of Science, Bangalore
    • Dates

       
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