Construction of an electronic device for monitoring voltage standing wave ratio (VSWR) of a transmission antenna. D.K.R.N. Pradeep, W.M.K.P. Wijayaratna, R. Lelwala, & T.G.J. Amarasena, Proc. 19th Technical Sessions of the Institute of Physics, Sri Lanka (March 2003) 17

An investigation on the applicability of plasma desorption mass spectrometry in the study of natural product compounds, D.D.N.B. Daya, U.K. Abeywarna, T.R. Ariyaratne, R.V. Coorey, C.K.G. Piyadasa, W.M.K.P. Wijayaratna and M.S.B. Mohottalage, Proc. 53rd Annual Sessions of Sri Lanka Assoc. Advmt. Sci., E2-38 (1997) 362

Performance of a new two-way ion production facility constructed for a plasma desorption mass spectrometer, D.D.N.B. Daya, U.K. Abeywarna, T.R. Ariyaratne, R.V. Coorey, C.K.G. Piyadasa and W.M.K.P. Wijayaratna, Proc. 52nd Annual Sessions of Sri Lanka Assoc. Advmt. Sci. El-18 (1996) 171

Performance of a low-cost second order electrostatic ion mirror for a time-of-flight plasma desorption mass spectrometer, C.K.G. Piyadasa, T.R. Ariyaratne and W.M.K.P. Wijayaratna, Proc. 52nd Annual Sessions of Sri Lanka Assoc. Advmt. Sci. El-16 (1996) 170

Effects of residual gas pressure on the mass resolution and the molecular ion yield of a time-of-flight mass spectrometer, C.K.G. Piyadasa, T.R. Ariyaratne and W.M.K.P. Wijayaratna, Proc. 52nd Annual Sessions of Sri Lanka Assoc. Advmt. Sci. El-17 (1996) 171

Performance of the newly constructed linear time-of-flight plasma desorptoin mass spectrometer, C.K.G. Piyadasa, U.K. Abeywarna, T.R. Ariyaratne, R.V. Coorey, D.D.N.B. Daya and W.M.K.P. Wijayaratna, Proc. 51st Annual Sessions of Sri Lanka Assoc. Advmt. Sci. El-06 (1995) 341

Performance of an electrostatic lens (Einzel lens) as an ion maneuvering device in a time-of-flight mass spectrometer, C.K.G. Piyadasa, U.K. Abeywarna, T.R. Ariyaratne, R.V. Coorey, D.D.N.B. Daya and W.M.K.P. Wijayaratna, Proc. 51st Annual Sessions of Sri Lanka Assoc. Advmt. Sci. El-07 (1995) 343

Optical electron polarimetry with heavy noble gases, T.J. Gay, J.E. Furst, K.W. Trantham, and W.M.K.P. Wijayaratna, Phys. Rev. A, 53 (1996) 1623
A clean ultra high vacuum system with single-structure diffusion pumps, T.J. Gay, J.A. Brand, M.C. Fritts, J.E. Furst, M.A. Khakoo, E.R. Mell, M.T. Sieger and W.M.K.P. Wijayaratna, J. Vac. Sci. Technol. A 12(5) (1994) 2903

Investigation of spin-orbit effect in the excitation of noble gases by spin-polarized electrons, J.E. Furst, W.M.K.P. Wijayaratna, D.H. Madison and T.J. Gay, Phys. Rev. A, 47, (1993) 3775

Extrapolation procedures in Mott electron polarimetry, T.J. Gay, M.A. Khakoo, J.A. Brand,, J.E. Furst, W.V. Meyer, W.M.K.P. Wijayaratna and F.B. Dunning, Rev. Sci. Instrum. 63, (1992) 114

An attempt to observe Mott scattering optically, J.E. Furst, T.J. Gay, W.M.K.P. Wijayaratna, K. Bartschat, H. Geesmann, M.A. Khakoo, and D.H. Madison, J. Phys. B: At. Mol. Opt. Phys. 25. (1992) 1089

Optical studies of polarized-electron?noble-gas collisions, T.J. Gay, J.E. Furst, H. Geesmann, M.A. Khakoo, D.H. Madison, and, W.M.K.P. Wijayaratna, Inst. Phys. Conf. Ser. No. 122 (1991) 265