Differential cross sections for 35 keV electrons elastically scattered from NH3

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Abstract
High precision relative elastic differential cross sections d sigma /d Omega e for electrons scattered from ammonia are presented over a wide range of momentum transfer K. The effect of the bond formation is seen qualitatively through comparison with an independent-atom model (IAM) calculation, and the validity range of this IAM is clearly defined. Recent calculations using CNDO type wavefunctions, CI computations, and ab initio calculations within the Borne approximation are also compared with experiment and found to constitute a qualitative improvement over the IAM approximation. Tavard's theorem is employed to estimate the exchange energy of the molecule.