THE CHARACTERIZATION OF THE SODIUM AND POTASSIUM IODIDE VAPOR SYSTEMS BY THE ANGULAR DISTRIBUTION MASS SPECTROMETRIC TECHNIQUE: (1) THE SODIUM IODIDE VAPOR PHASE; (2) THE POTASSIUM IODIDE VAPOR PHASE

THOMAS ALEXANDER DEMERCURIO, Purdue University

Abstract

The ionization and fragmentation processes which result from the electron bombardment of the sodium iodide vapor system have been determined through the use of angular distribution mass spectrometry (ADMS). The species which have been identified as existing in the equilibrium vapor phase are: NaI, Na(,2)I(,2), Na(,3)I(,3), and Na(,4)I(,4). In addition, the relative contributions of each of the neutral vapor species to the eight ionic species, Na('+), I('+), NaI('+), Na(,2)I('+), I(,2)('+), Na(,2)I(,2)('+), Na(,3)I(,2)('+), and Na(,4)I(,3)('+) were determined as a function of ionizing energy. The potassium iodide vapor system was also studied using the ADMS technique. The species KI, K(,2)I(,2), K(,3)I(,3), and K(,4)I(,4) have been shown to exist in the equilibrium vapor phase. Relative contributions of the neutrals to the ions, K('+), K(,2)('+), I('+), KI('+), K(,2)I('+), I(,2)('+), K(,2)I(,2)('+), and K(,3)I(,2)('+) have also been determined. The mole fractions of the species in the vapor phase above solid sodium iodide and above solid potassium iodide along with the true heats of sublimation and heats of dissociation of the higher polymers into monomers have been calculated.

Degree

Ph.D.

Subject Area

Chemistry

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