• P Saraswathy

      Articles written in Pramana – Journal of Physics

    • Isotope shifts in theA1 Π −X1 Σ+ system of PN molecule

      P Saraswathy G Krishnamurty

      More Details Abstract Fulltext PDF

      The emission spectrum of PN molecule was excited in an electrodeless microwave discharge in sealed tubes containing phosphorus, nitrogen and neon. Isotope shifts of several bands of theA1Π −X1Σ+ system were studied using nitrogen isotope. Vibrational assignments of several bands were confirmed.

    • Rotational analysis ofA1Π-X1Σ+ bands of P14N and P15N: Perturbatio studies in theA1Π state

      P Saraswathy G Krishnamurty

      More Details Abstract Fulltext PDF

      The ultraviolet band systemsA1Π-X1Σ+ of P14N and P15N were excited in an electrodeless tube containing traces of phosphorus specpure nitrogen and neon using a microwave discharge (2450 MHz). Bands of the isotopic species, P15N, were obtained using15N2 enriched to 95.5%. Rotational analyses of eleven bands of P14N and sixteen bands of P15N were carried out. Three perturbing statese3Σ,d3Δ andb3Π, arising from the lower valence configurations were identified from the observed perturbations in thev′=0–4 levels of theA1Π state. Deperturbation studies led to the determination of molecular constants of the perturbing states. Vibrational assignments of the perturbing states were made from isotope shift studies.

    • Rotational analysis ofA1Π-X1Σ+ bands of As14N and As15N: perturbation studies in theA1Π state

      P Saraswathy G Krishnamurty

      More Details Abstract Fulltext PDF

      The ultraviolet bands ofA1Π-X1Σ+ system of As14N and its isotopic species As15N were excited in a quartz tube containing specpure nitrogen and traces of AsCl3 vapour, using a microwave discharge (2450 MHz). Bands of As15N were obtained using15N2 enriched to 95.5%. Rotational structure of several bands of As14N and As15N photographed under high dispersion (0.14 Å/mm) was reanalysed. Detailed studies of the observed perturbations in the levels ofν′ = 0 to 4 led to the identification of two3Σ and aC1Σ states. Molecular parametersTe, ωe, ωexe, Beandαewere determined for all the electronic states studied. Vibrational assignments of the perturbing levels were made using the isotope shift studies.

    • Line broadening studies in low energy plasma focus

      P Meenakshi Raja Rao P Saraswathy G Krishnamurty R K Rout S K H Auluck Anurag Shyam I V Kulkarni Dipak H Oza

      More Details Abstract Fulltext PDF

      Optical emission spectroscopic studies were carried out to characterise the plasma leading to the estimation of two plasma parameters, electron density and temperature. These experiments were conducted on a 2 kJ plasma device which is equipped with squirrel cage electrode configuration enclosed in a glass vacuum chamber filled with hydrogen at a pressure of 5 mbar. Spectral emissions obtained from each flash were photographed in the region of 4000–6000 Å using one metre Czerny-Turner spectrograph cum monochromator. Detailed examination of the observed features showed that theHβ andHλ lines of hydrogen showed significant broadening of the order of 35 Å FWHM which is due to Stark effect expected in high density plasmas. Further several atomic lines of Cu and Zn from the electrode material (brass) showed broadening which was due to quadratic Stark effect. A comparative study of the broadening of lines obtained in DC arc, hollow cathode and plasma focus was made. Electron density from Stark broadened hydrogen lines and quadratic Stark Coefficient C4 for the CuI and ZnI lines were evaluated. The excitation temperature was determined from the line intensity ratio method using CuI lines.

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.