1. P.K. Leavitt and P.A. Thiel, J. Vac. Sci. Tech. A8, 148 (1990).
2. M.A. Henderson, R.D. Ramsier, and J.T. Yates, Jr., J. Vac. Sci. Tech. A9, 2785 (1991).
3. E. Apen, R. Wentz, E Pompei, and J.L. Gland, J. Vac. Sci. Tech. A12, 2946 (1994).
4. Swagelok fittings are available from Swagelok, 31400 Aurora Road, Solon, OH 44139.
5. M.A. Mendicino and E.G. Seebauer, J. Vac. Sci. Tech. A10, 3590 (1992).