1. R.C. Henderson and R.F. Helm, Surface Sci. 30, 310 (1972).
2. J.A. Stroscio and W. Ho, Rev. Sci. Instrum. 55, 1672 (1984).
3. K. Jacobi and W. Ranke, J. Electron Spectrosc. Relat Phenom. 8, 225 (1976).
4. M.J. Bozack, L. Muehlhoff, J.N. Russell, Jr., W.J. Choyke, J.T. Yates, Jr., J. Vac. Sci. Technol. A5, 1 (1987).
5. Metal vapor pressures are listed and graphed in R Rosebury, Handbook of Electron Tube and Vacuum Techniques (American Institute of Physics, New York, NY, 1993), pp. 142–148.