Problem_Set_1

Problem_Set_1 - Chemistry 120A Spring Semester, 2009....

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Chemistry 120A Spring Semester, 2009. Problem Set 1 Due in class, Friday January 30, 2009. 1. The Davisson-Germer experiment of the diffraction of electrons by an ordered metal surface gives a beautiful illustration of the validity of the de Broglie relation connecting the particle-like properties of electrons (their momentum) to their wavelike properties (their wavelength, which causes diffraction if same as interatomic spacing). (a) A 40eV beam of electrons shows no diffraction from a silver surface, a 54eV beam exhibits a clear diffraction pattern. By 60eV the diffraction structure is again largely lost. Work out the wavelengths that these 3 beam energies correspond to. (b) If one were worried about damage to the surface caused by the energy of the electrons necessary to cause diffraction, one could consider using a beam comprised of different particles. Work out the energy of a beam of helium atoms that could exhibit diffraction on the same surface and discuss whether or not this is
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Problem_Set_1 - Chemistry 120A Spring Semester, 2009....

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