• S Swaminathan

      Articles written in Pramana – Journal of Physics

    • Characteristics of electrostatic charged particle oscillator ion sources

      S Swaminathan V S Venkatasubramanian

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      Two ion sources of the charged particle oscillator type are described. The discharge chamber consists of an outer cylinder as cathode and an axial wire or a pair of wires along the axis as the anode. The energy spectra and ionic composition of the ion beam have been measured with a double focusing mass spectrometer of the Mattauch-Herzog design constructed in the laboratory. A high percentage of dissociated ions and multiply charged ions has been observed in the ion beam. A brief description of the mass spectrometer is also given.

    • Crystal structure of N-m-tolyl phthalimide

      K Chandrasekhar Vasantha Pattabhi S Swaminathan

      More Details Abstract Fulltext PDF

      N-m-tolyl phthalimide, C15NO2H11 crystallizes in the space group Cc with unit cell dimensions,a=8·54(1),b=19·89(2),c = 7·59(1)A, β=114·53(1)° andZ=4.V=1173(2)A3,Dm=1·35(1),Dc = 1·344 mg.m−3,Mr=237 λCoKa=1·7903A. The structure was solved byMULTAN and refined to an R-factor of 0·116 for 632 counter reflections. The molecules are held together by van der Waal’s forces. The angle between the tolyl plane and the plane through the phthalimide group is 53·4(4)°.

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