• Emission bands of halogens - Part IV. Diffuse bands of bromine

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/025/02/0138-0150

    • Keywords

       

      Bromine; Emission Band; Rabie; Final Level; Diffuse Band

    • Abstract

       

      A large number of new diffuse bands in the emission spectrum of bromine are recorded. The wavelengths of all the diffuse bands of bromine in the region 4200–2000 A are given together with the experimental details. The bands occur in different sets of groups which involve frequency differences of the order of 330, 220 and 480 cm.−1 among the component bands. These are explained, as in the case of iodine, as arising in three initial states 1g (3Π1g), 1g (1Πg) andΠ2,1g with frequencies of about 330, 220 and 480 cm.−1 The final states of all these bands will be repulsive, and they are attributed to just these states which are theoretically possible. Besides these bands, there are nine broad bands whose mutual vibrational frequencies are so irregular that they cannot be considered as belonging to a single group arising in a single transtion. These bands are explained as arising in a state 1u (3Σu+) and having for their final levels nine repulsive states which are identified with just the theoretically possible ones. The approximate position of these four states 1g (3Π1g), 1g (1Πg),Π2,1g and 1u (3Σu+) are at 55534, 61444, 66500 and 47000 cm.−1, whereas for iodine they are at 51583, 58572, 56000 and 44900 cm.−1

    • Author Affiliations

       

      Putcha Venkateswarlu1

      1. Physics Department, Benares Hindu University, India
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