Thesis (PH. D.)--University of Michigan, 1938. / Reprinted from an article, by Paul Rood and R.A. Sawyer, published in the Astrophysical journal, v. 87, no. 1, January 1938.

Thesis (Ph. D.)--University of Michigan, 1945. / "Reprinted from the Journal of chemical physics, vol. 14, no. 10 ... October, 1946." Master microform held by: UnM. Bibliographical foot-notes.

Although there have been recorded many spectra of dispersions of reactive and unreactive molecules in inert matrices, there has been no real attempt to explain quantitatively the nature of the forces and interactions of these matrices that act on the molecular vibrations of the trapped species. In the present study the infra-red spectra of formaldehyde and water in solid argon and nitrogen matrices and of solid formaldehyde are used as a basis for a discussion and analysis of the conditions that prevail in such matrices. Isotope effects, molecular association, inter-molecular coupling, rotation, the effect of trapping in different lattice positions, and matrix-gas frequency shifts are considered in the Interpretation of the observed spectra. / Science, Faculty of / Chemistry, Department of / Graduate

A number of N-substituted-3-hydroxy-3-phenylphthal-imidines and some of the isomeric amides have been prepared in order to study changes in the infrared spectra of these compounds due to structural changes in the molecule, particularly with reference to a hydroxyl band at 3.0µ and a carbonyl band at 5.75µ.

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O espectro vibracional Raman e infravermelho, ao lado de outros métodos físicos, constitui um meio poderoso para a determinação de estruturas de compostos. Na presente dissertação, apresentamos os espectros Raman e infravermelho de trimetafosfatos de alguns elementos lantanídicos e de ítrio, no estado sólido. Os espectros Raman dos trimetafosfatos de lantânio e cério trihidratados, e os de gadolínio e ítrio tetrahidratados, são originais. Pela aplicação da teoria de grupos, fizemos uma análise dos espectros observados na tentativa de determinar a estrutura do ânion P3O3-9. Os resultados obtidos evidenciam, para os trimetafosfatos de lantânio e cério trihidratados, que a simetria do íon P3O3-9 corresponde ao grupo pontual D3h. Quanto aos trimEtafosfatos de ítrio e gadolínio tetrahidratados, encontramos dificuldades em concluir se o ânion P3O3-9 pertence ao grupo pontual C3V ou Cs. Fizemos um cálculo aproximado das constantes de fôrças, visando obter alguma informação sôbre a ordem de ligação das ligações P-O envolvida nos trimetafosfatos, em particular no de sódio. / The infrared and Raman spectra of the following compounds have been recorded: LaP3O9.3H2O, CeP3O9. 3H2O, YP3O9, 4H2O and GdP3O9.4H2O. We have studied the spectra of these compounds, in an attempt to determine the structures of the P3O3-9 anions. The analysis of the vibracional spectrum of the P3O3-9 anion in the P-O stretching region indicates D3H symmetry for the first and second compounds. For the third and fourth compounds, it is difficult to distinguish between C3V and Cs symmetry.