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Item Quick detection of active compounds in crude extracts of selected plants using plasma desorption mass spectrometry (PDMS)(2000) Dahanayaka, S.A.; Barlo Daya, D.D.N.; Mohottalage, M.S.B.; Premakumara, G.A.S.; Ariyaratne, T.R.Item Some properties of lightning ground flashes observed in and around Sri Lanka, and their seasonal variations(2002) Liyanage, J.P.; Sonnadara, D.U.J.; Fernando, I.M.K.; Weerasekera, A.B.; Lelwala, R.; Ariyaratne, T.R.Item Activity of cloud-to-ground lightning observed in Sri Lanka and in surrounding area of the Indian Ocean(Institute of Physics:Colombo, 2001) Weerasekera, A.B.; Sonnadara, D.U.J.; Fernando, I.M.K.; Liyanage, J.P.; Lelwala, R.; Ariyaratne, T.R.Item Construction of a keV pulsed ion source and the measurement of damage cross -sections for keV ion induced sputtering from solid targets(University of Peradeniya. Peradeniya, 1997) Barlodaya, D.D.N.; Ariyaratne, T.R.; Hankansson, P.; Sundqvist, B.U.R.; Ens, W.Item Performance of a low cost second order electrostatic ion mirror for a time-of-flight mass spectrometer(1996) Piyadasa, C.K.G.; Ariyaratne, T.R.; Wijayaratne, W.M.K.P.Item Evaluation of finger-feel firmness as a subjective measurement of tomato quality degradation in the retail market(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2008) Ranatunga, C.L.; Jayaweera, H.H.E.; Ariyaratne, T.R.Item Improved performance of a linear mode plasma desorption time-of-flight mass spectrometer with an electrostatic wire guide(Institute of Physics:Colombo, 2002) Dahanayake, S.A.; Daya, D.D.N.B.; Ariyaratne, T.R.; Mohottalage, M.S.B.Item Activity of cloud-to-ground lightning observed in Sri Lanka and in surrounding area of the Indian Ocean(Institute of Physics. Colombo, 2001) Weerasekera, A.B.; Sonnadara, D.U.J.; Fernando, I.M.K.; Liyanage, J.P.; Lelwala, R.; Ariyaratne, T.R.Item Kinetic energy measurements of ions emitted from alkali halides and their mixtures in 252Cf plasma desorption mass spectrometry(University of Peradeniya. Peradeniya, 1997) Abeywarna, U.K.; Zubarev, R.A.; Hakansson, P.; Ariyaratne, T.R.Kinetic energy measurements of both positive and negative ions emitted from several alkali halides and their mixtures are reported. The measurements were conducted using the energy cut-off property of the ion mirror of a reflector type 252Cf plasma desorption mass spectrometer. The results obtained indicate that some fraction of the desorbed ions emitted under 252Cf bombardment have a kinetic energy deficit compared to die ions which gain full kinetic energy during the acceleration-region. The initial kinetic energy of a particular ion was found to be rather independent upon the sample composition.Item Locating cloud- to -ground lightning flashes with simultaneous two -station measurements(Institute of Physics. Colombo, 2000) Sonnadara, D.U.J.; Weerasekera, A.B.; Fernando, I.M.K.; Lelwala, R.; Jayaratne, K.P.S.C.; Ariyaratne, T.R.; Namasivayam, S.; Bandara, K.R.A.