1961-present, Assistant, Associate, and Professor of Physics, NMSU
1974-1993, Co-Director, Electron Microscopy Laboratory
1993-present, Acting Director, Electron Microscopy Laboratory
Research Interests
X-ray physics
Electron, atomic, and solid state physics
Physics education
Research and Creative Activities
Liefeld, R., B. Mason, "Electron Excited M-Region Resonance X-ray Excitation Spectra from Cerium and Oxidized Cerium", J. Vac. Sci. Technol. A8(6), 4057, 1990.
Liefeld, R., J. Wachter, "Comparison of M-Region X-ray and Auger-Electron Spectra for Near Threshold Electron Excitation of Metallic and Oxidized Lanthanum", J. Vac. Sci. Techno. A7(2), 249, 1989.
Liefeld, R., M.B. Chamberlain, and A.F. Burr, "Threshold Electron Excitation of Auger-Electron and X-Ray Emissions in La", J. Vac Sci, Technol. A2(2), 973, 1984.
Liefeld, R., M.B. Chamberlain, and A.F. Burr, "Threshold Electron Excitation of Auger-Electron and X-Ray Emissions in Ce", J. Vac. Sci. Technol., A1(2), 1169, 1983.