Recent Selected Publications

“Combined electron and focused ion beam system for improvement of secondary ion yield in secondary ion mass spectrometry instrument” L. Ji, Q. Ji, K. N. Leung, and R. A. Gough, Appl. Phys. Lett. 89, 164103 (2006).

“Conformal metal thin-film coatings in high aspect ratio trenches using a self-sputtered rf-driven plasma source” L.Ji, J.K. Kim, Q. Ji, K.N. Leung, Y. Chen and R. Gough, J. Vac. Sci. Technol.B 25(4), Jul/Aug (2007) 1227.

“Development of C-60 plasma ion source for time-of-flight secondary ion mass spectrometry applications” Qing Ji, Ye Chen, Lili Ji, Sami Hahto, Ka-Ngo Leung, Tae Geol Lee and Dae Won Moon Rev. Sci. Instrum., 79, 02B309 (Feb 2008).

“Ion source for neutral beam injection meant for plasma and magnetic field diagnostics” Jaakko Hannes Vainionpaa, Ka-Ngo Leung, Richard A. Gough, Joe W. Kwan and Fred Levinton, Rev. Sci. Instrum., 79, 02C102 (Feb 2008).

“Negative chlorine ions from multicusp RF ion source for heavy ion fusion applications” S.K. Hahto, S.T. Hahto, J.W. Kwan, K.N. Leung, Rev. Sci. Instrum., Vol. 74, (June 2003) 2987.

“Mini RF-driven ion source for focused ion beam system” X. Jiang, Q. Ji, A. Chang, and K.N. Leung, Rev. Sci. Instrum., Vol. 74, (April 2003) 2288.

“Resolution improvement for a maskless micro-ion-beam reduction lithography system”, X. Jiang, Q. Ji, Lili Ji, Audrey Chang and Ka-Ngo Leung, J. Vac. Sci. Technol. B 21(6), Nov/Dec 2003.

“Muticusp ion source with external rf antenna for production of protons” S.K. Hahto, S.T. Hahto, Q. Ji, K.N. Leung, S. Wilde, E. L. Foley, L. R. Grisham and F. M. Levinton, Rev. Sci. Instrum., Vol. 75, (Feb 2004) 355.

“Simulation of a D-T neutron source for neutron scattering experiments” T.P. Lou, B.A. Ludewigt, J.L. Vujic and K. N. Leung, Nuclear Instruments and Methods in Physics Res. A521 (2004) 399-406.

"First PGAA and NAA experimental results from a compact high intensity D-D neutron generator” J. Reijonen, K. N. Leung, R.B. Firestone, J.A. English, D.L. Perry, A. Smith, F. Gicquel, M. Sun, H. Koivunoro, T.P. Lou, B. Bandong, G. Garabedian, Zs. Revy, L. Szentmiklosi, and G. Molnar, Nucl. Instrum. And Meth. In Phys. Res. A 522 (2004) 598-602.

“The characteristion of legacy radioactive mateials by gamma spectroscopy and prompt gamma activation analysis (PGAA)” G.A. English, R.B. Firestone, D.L. Perry, J. Reijonen, B. Ludewigt, K.N. Leung, G. Garabedian, G. Molnar and Z. Revay, Nucl. Instrum. and Meth. In Phys. Res. B 213 (2004) 410-413.

“The use of prompt gamma activation analysis (PGAA) for the analyses and characterization of materials: Photochromic materials” D.L. Perry, G.A. English, R.B. Firestone, K.N. Leung, J. Reijonen, B. Ludewigt, G. Garabedian, G.L. Molnar and Z. Revay, Nucl. Instrum. and Meth. In Phys. Res. B 213 (2004) 527-529.

“Negative ions for heavy ion fusion and semiconductor manufacturing applications” S.K. Hahto, S.T. Hahto, J. Kwan, K.N. Leung, L.R. Grisham and K. Saadatmand, Rev. Sci. Instrum. Vol.75(5) (2004).

“Combined electron- and ion-beam imprinter and its applications,” Q. Ji, L. Ji, Y. Chen, and K. N. Leung, Appl. Phys. Lett., 85, 4618 (2004).

“Fast ion beam chopping system for neutron generators,” S.K. Hahto, S. T. Hahto and K. N. Leung, Rev. Sci. Instrum. 76(2) (2005).

“Experimental evaluation of a negative ion source for a heavy ion fusion negative ion driver, L.R. Grisham, S.K. Hahto, S.T. Hahto, J. W.Kwan and K.N. Leung, Nucl. Instrum. & Meth. A544 (2005) 216-224.

“Development if a 27.12 MHz radio frequency driven ion source with 3 mTorr operation pressure for neutron genertors,” X. Jiang, Y. Chen, L. Ji, Q. Ji, and K. N. Leung, Rev. Sci. Instrum., 76, 103302 (2005).

“Development of focused ion beam systems with various ion species” Q. Ji, K. N. Leung, T-J King, X. Jiang and Bill R. Appleton, Nucl. Instrum. And Meth. In Phys. Res. B 241 (2005) 335-340.

“Application of deuteron-deuteron (D-D) fusion neutrons to Ar40/Ar39 geochronology” Paul R. Renne, Kim B. Knight, Sebastien Nomade, Ka-Ngo Leung and Tak-Pui Lou, Appl. Radiation and Isotopes, 62 (2005) 25-32.