1. J.A. Polta and P.A. Thiel, J. Vac. Sci. Technol. A5, 386 (1987).
2. Balzers Part No. TCV 102. Obtained from Balzers, 8 Sagamore Park, Hudson, NH 03051.
3. J.P. Saint-Germain, G. Abel, and B.L. Stansfield, J. Vac. Sci. Technol. A4, 2391 (1986).
4. Time delay CNS-35-76 from Newark Electronics, 4801 N. Ravenswood Avenue, Chicago, IL 60640–4496.
5. Available from Tripp Lite, 500 N. Orleans Street, Chicago, IL 60610.