• K N Upadhya

      Articles written in Pramana – Journal of Physics

    • TheB2Σ-X2Σ system of the CaF molecule

      Ram Samujh Ram S B Rai K N Upadhya

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      The spectrum of theB2Σ-X2Σ system of the CaF molecule has been photographed in the second order of a 10.6 m concave grating spectrograph with 0.33 Å/mm dispersion. The rotational structure of the (0, 0) and (1, 0) bands has been analysed and the precise molecular constants have been obtained. Using the constants so determined the band origins of a large number of bands with 0 <v′,v″ < 10 have been calculated and used to obtain the accurate vibrational constants forB andX states and these are presented.

    • Electronic spectra of parafluorobromobenzene

      Shashi K Singh K N Upadhya

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      The electronic absorption spectrum of parafluorobromobenzene is reported together with its band shape and molecular geometry. The electronic transition is found to be the 2900–2400 Å system and the analysis consistent with other paraheterohalogenated benzenes. The intense bands, including 0–0, are double headed and areB-type in nature.A-type vibronic bands are also observed although less intense than theB-type bands. In all 9 excited states and 5 ground state fundamentals could be assigned.

    • The C2II-X2Σ system of SrF molecule

      Ram Samujh Ram S B Rai K N Upadhya

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      The spectrum of the C2II-X2Σ system of SrF molecule has been investigated under high resolution. The rotational structure in the (0, 0) band has been analysed and the rotational constants for the C2II state have been obtained. The vibrational analysis of this system has been carried out using the band heads from the high resolution spectrogram and also the band origins and the precise vibrational constants have been reported for both the participating states.

    • The B-A system of CP molecule

      R Tripathi S B Rai K N Upadhya

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      The B-A system of CP molecule has been reinvestigated. The rotational structures in the (0, 0) and (1, 1) bands have been photographed in the second order of a 10.6 m grating with 25µ slit width. The molecular constants have been determined using a weighted least squares fit computer program. It is found that the spin-splitting constant in the B-state is negative and not positive as reported by previous workers. An accurate value ofα in the A-state could be determined. The present analysis also suggests that the spin-splitting constant in the ground state of CP should be positive, hence the assignment of theR1 andR2 orP1 andP2 branches in the B-X system of CP by Barwaldet al should be interchanged.

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