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The geometrical structure of molecules can be worked out directly from the observed electron diffraction pattern by using this method. The principle is the same as that of other electron diffraction methods such as LEED and RHEED , but the obtainable diffraction pattern is considerably weaker than those of LEED and RHEED because the density of the target is about one thousand times smaller and the orientation of the target relative to the electron beams is random, which corresponds to incoherent scattering. In the case of determining the structure of complex molecules, the information obtained from rotational and The Molecular Scattering Intensity . The former decreases Monotonically and contains no information about the molecular structure. The latter has Sinusoidal modulations as a result of the Interference of the scattering Spherical Waves generated by the scattering from the atoms included in the target molecule. The interferences reflect the distributions of the atoms composing the molecules, so the molecular structure is determined from this part. |
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