• Overlapping B3Π0uX1Σg/+ and 1Π1uX1Σg/+ non-radiative characteristic of Br2 vapour in the wavelength region 505–541 nm

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    • Keywords


      Photoacoustic spectrum; laser spectroscopy; non-radiative channels; predissociation effects

    • Abstract


      The vibronic vapour phase photoacoustic spectrum of Br2 in the wavelength region 505–541 nm (19796–18480 cm−1) has been recorded using microphone as well as pump-probe method. Discrete vibronic bands superimposed on a monotonically increasing continuum background towards the dissociation limit results from the overlapping B3Π0u/+X1Σg/+ and 1Π1uX1Σg/+ electronic transitions. Vibronic bands originating from υ″=0 have been used to estimate the relative rate of non-radiative relaxation as a function of the excited state B3Π0u vibrational quantum number υ′. A comparison with the optical absorption spectroscopy of Br2 leads to the identification of three broad spectral regions between 505 and 541 nm (19796 and 18480 cm−1) on the basis of different non-radiative relaxation processes.

    • Author Affiliations


      Ramesh C Sharma1 SN Thakur1 2

      1. Physics Department and Centre for Laser Technology, Indian Institute of Technology, Kanpur - 208 016, India
      2. Laser Spectroscopy Laboratory, Banaras Hindu University, Varanasi - 221 005, India
    • Dates

  • Pramana – Journal of Physics | News

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