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Sternheher, Phys. , 84,244 (1951);95,736(1954);105, 158 (1957). 2. E. Chamberlain and J. C. Zorn, Phys. , 129,677 (1963). 3. B. Bederson, J. Eisinger, K. Rubin, and A. Salop, Rev. Sci. , 31,852(1960). 4. A. Salop, E. Pollack, and B. Bederson, Phys. , 124. Pollack, E. J. Robinson, and B. Bederson, Phys. , 134, A1210 (1964). 5. H. Scheffers and J. Stark, Phys. , 35,625 (1934). 6. E. U. Condon and G. H. Shortley, The Theory of Atomic Spectra, Cambridge University Press, New York, 1951,p. 6Off. 7. Dalgarno and A.
Since this incremental background gas density exists only during the measurement of the scattered intensity, its effect cannot be calculated as easily as that of the constant background no. Equation (23) defines the contribution of background scattering as (1 +a), where ct is given by Eq. (25). This equation cannot be solved as written, but since ct is small with respect to unity, simple approximations are permissible. First, the total path length D is broken up into j regions and the average density in each region, iij, is taken outside the integral.
In terms of the coordinate system in Figure 3a, this experimental potential, obtained from appropriate scattering experiments in the same manner as atom-atom potentials, is then assumed to be ELASTIC SCATTERING OF HIGH-ENERGY BEAMS 49 where r is the distance between the center of mass of the molecule and the interacting atom, R is the distance between a constituent atom of the molecule and the interacting atom, and 0 is the angle between r and a, the half length o f the molecular bond, so that do = 2n sin 0 do.