1. C.G. Pantano and T.E. Madey, Appl. Surf. Sci. 7, 115 (1981).
2. R.D. Ramsier and J.T. Yates, Jr., Surf. Sci. Reports 12, 243 (1991).
3. J.T. Yates, Jr., M.D. Alvey, K.W. Kolasinski, and M.J. Dresser, Nucl. Inst. and Methods in Phys. Res. B27, 147 (1987). The first apparatus of this sort for low incident current LEED studies was reported in P.C. Stair, Rev. Sci. Inst. 51, 132 (1980).
4. Galileo Electro-Optics Corp., Galileo Park, P.O. Box 550, Sturbridge, MA 01566.
5. No. 3394D Quantar Technology, Inc., 3004 Mission Street, Santa Cruz, CA 95060–5700.