• Emission bands of halogens - Part II. Iodine bands arising in 1g (3Π1g) andΠ2,1g states

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/025/02/0119-0132

    • Keywords

       

      Emission Band; Potential Energy Curve; Iodine Atom; Diffuse Band; Iodine Molecule

    • Abstract

       

      The wavelengths of the maxima of all the diffuse bands from 4800 to 2680 A are given. The bands occur in different groups which involve frequency differences of the order of 165 cm.−1, 215 cm.−1 and 360 cm.−1 among the component bands. Five groups of bands with frequency difference of 165 cm.−1 are explained in Paper I. In this paper five groups with frequency differences of 215 cm.−1 and another five groups with frequency differences of 360 cm.−1 among the component bands are discussed. It is shown that they arise in a transition from two initial stable states with frequencies of 215 cm.−1 and 360 cm.−1 to a common set of five different final states which are all unstable. These final states are identified with just those states which are the only theoretically possible ones. The well-known continuum at 3416 A which occurs in emission and in absorption at high temperature is attributed to the transition 1g (3Π1g → Ou (1Σu)) in the iodine molecule. The mechanism of the fluorescent bands corresponding to the emission bands is also discussed.

    • Author Affiliations

       

      Putcha Venkateswarlu1

      1. Physics Department, Benares Hindu University, India
    • Dates

       
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