1. P. Hollins and J. Pritchard, J. Vac. Sci. Technol. 17, 665 (1980). This report also contains references to earlier window sealing methods.
2. Z. Xu and J.T. Yates, Jr., J. Vac. Sci. Technol. A8, 3666 (1990).
3. R.G. Tobin, C.. Chung, and J.S. Luo, J. Vac. Sci. Technol. A12, 264 (1994).
4. C.. Damerow and W. Erley, J. Vac. Sci. Technol. A5, 2974 (1987).
5. A. Bradshaw, private communication. The gaskets may be obtained from Busak and Sham-ban GmbH & Co., Handwerkstr. 5–7, 70565 Stuttgart, Germany.