• Baij Nath Khanna

      Articles written in Proceedings – Section A

    • Emission spectrum of chlorine excited in the presence of argon - Part I. The band system in the region 2600–2390 Å

      Putcha Venkateswarlu Baij Nath Khanna

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      The spectrum of chlorine excited in the presence of argon has been photographed with a 21-ft. grating spectrograph in the first order. Two band systems in the region 2600–2390 Å and 2365–2239 Å are observed which appear to be respectively analogous to the 2950–2670 Å and 2660–2590 Å systems of bromine reported earlier by Venkateswarlu and Verma. The wavelengths and the wavenumbers of all the bands in the system 2600–2390 Å are given. The vibrational scheme along with the corresponding Franck-Condon parabola is also given. The analysis suggests that the lower state of the system is the 3π(Ou+_ state established by Elliott at 17658 cm.−1 and that the upper state is at 67773 cm.−1 The vibrational constants obtained arew0′ = 246·6 cm.−1,w0x0′ = 0·615 cm.−1,w0″ = 255·2 cm.−1,w0x0″ = 5·5 cm.−1,w0y0″ = −0·0155 cm.−1 andw0z0″ = 0·00115 cm.−1

    • Emission spectrum of chlorine excited in the presence of argon - Part II. The band system in the region 2365-2239Å

      Baij Nath Khanna

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      The weak band system in the region 2365-2239 Å is discussed in this paper. The wavelengths and the wavenumbers of the bands photographed with the first order of a 21-ft. grating spectrograph are recorded. The vibrational analysis of the bands and their corresponding intensity distribution are also given. The analysis shows that the lower state of the system is the same as that of the 2600-2390 Å system discussed in the earlier paper and is the 3π (Ou+) state established by Elliott at 17658 cm.−1 The constants of the upper state arew0′ = 261·5 cm.−1,w0x0′ = 0·812 cm.−1, T0=61290 cm.−1.

    • Emission spectrum of bismuth monochloride - Part I. The vibrational analysis of the 6170–4220 Å system

      Putcha Venkateswarlu Baij Nath Khanna

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      Bismuth chloride has been excited in flowing condition with an uncondensed transformer discharge. About 390 bands are observed in the present experiments of which only 140 were recorded by earlier workers. The vibrational constants obtained are the same as those obtained by Morgan from obsorption experiments except for the addition of a cubic term for the upper state. It appears quite likely that the upper state of the system dissociates into Bi (4S3/2) + Cl (2P1/2) while the lower state, which is probably the ground state, dissociates into Bi (4S3/2) + Cl (2P3/2). The rough values of the dissociation energies obtained by extrapolations are D0′=3750 cm.−1 and D0″=24614 cm.−1

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