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A weak absorption in iodine vapour was reported by earlier workers to not obey Beer's Law, and was attributed to the dimer I₄. The ultraviolet spectrum of iodine vapour was reinvestigated in this study on a more quantitative basis. The extinction coefficients have been found to be independent of concentration of iodine (10 ̄⁵ to 10 ̄² M), pressure of an inert gas (up to 1 atm), and temperature (25°C to 220°C, except for the usual temperature broadening). The absorption continuum (maximum 2694±3 A; oscillator strength 4.98 ±. 05 x 10 ̄⁴) must be due to a transition in the free molecule to a repulsive state correlating with either ²P3/2 + ²P3/2 or ²P3/2 + ²P1/2 atoms. The identification of the upper state involved and of the mechanism allowing the transition to occur were not possible with the available evidence. The previous identification of I₄ in solution and of Br₄ in the vapour phase, determined by similar ultraviolet continua, are discussed in relation to the lack of evidence for I₄ in the vapour phase found in this study. / Science, Faculty of / Chemistry, Department of / Graduate

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by Wong Tong Pak. / Bibliography: leaves 188-189 / Thesis (M.Ph.)--Chinese University of Hong Kong, 1986

Thesis (M. Sc.)--Cambridge. / Typescript.

Thesis (Ph. D.)--University of Michigan, 1933. / From Physical review, v. 42, December 1, 1932.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

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