1. Gellene, G. I., and Porter, R. F., Acct. Chem. Res.
16, 200 (1983).
2. Gellene, G. I., Cleary, D. A., and Porter, R. F. J. Chem. Phys.
77, 3471 (1982).
3. Natl. Stand. Ref. Data Ser. Natl. Bur. Stand;DR Stoll,1971
4. In this calculation, we used an effective interaction length of 0.41 cm, which is the geometric length of the collision chamber plus a 30% increase to account for atoms effusing through the slits in the path of the beam.
5. Fluendy, M. A. D., and Lacoley, K. P., Chemical Applications of Molecular Beam Scattering, Chapman and Hall, London, 1973, pp. 37–43.