1. M. Bozack, L. Muehlhoff, J.N. Russell, Jr., W.J. Choyke, and J.T. Yates, Jr., J. Vac. Sci. Technol. A5, 1 (1987).
2. P.L. Hagans, B.M. DeKoven and J.L. Womack, J. Vac. Sci. Technol. A7, 3375 (1989). Laser-drilled micron-size pinholes are produced in disks fitting VCR fittings by Precision Laser Services, 314 E. Wallace St., Ft. Wayne, IN 46803.
3. Capillary array blanks, made without being coated with active surfaces for use as electron multipliers, are available from Galileo Electro-Optics Corporation, Galileo Park, P.O. Box 550, Sturbridge, MA 01518. Sizes up to 25-mm diameter are available.
4. A. Winkler and J.T. Yates, Jr., J. Vac. Sci. and Technol. A6, 2929 (1988);
5. also see C.T. Campbell and S.M. Valone, J. Vac. Sci. and Technol. A3, 408 (1985).