Etudes en spectroscopie Compton des molécules et des solides

Abstract : The present work provides new contribution in compton defect studies of molecules or solid systems. In the first of the document, the general theory of collisions is summarized as well as the fundamental approximations used to calculate differential scattering cross-sctions. The last part exhibits results concerning molecular or solid targets whose calculations generalize the atomic casses. A molecular traitment has been detailed and applied here to the simpler case, i.e. the hydrogen molecule. The results are compared to existing measurements of compton shifts. Different ground state wave fonctions of the hydrogen molecule have been used. Their results are discussed in terms of relation ships between chemical bond and compton spectroscopy. A comparison between all targets containing two electrons (hydrogen molecule, helium and two isolated hydrogen atoms) allows to conclude in particular additivity contributions of atomic compton defects. These properties have been applied to estimate the compton defect in aluminium. The corresponding calculation consists to add up both core and valence contributions. The compton defect due to valence electrons is based on the simple assumption of a coulomb electron-hole interaction. The corresponding formalism developped here has been shown to establish a quantitative interpretation of the compton defect in simple metals. Between new features predicted by such a model, the discontinuities appearing at Fermi momenta were rediscovered in the analysis of Weiss's previous measurements (1975)
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Mohammed Ibn Chaikh. Etudes en spectroscopie Compton des molécules et des solides. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1987. Français. ⟨NNT : 1987METZ004S⟩. ⟨tel-01775719⟩

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