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Journal of Spectroscopy
Volume 2016 (2016), Article ID 2368131, 9 pages
Research Article

Study of Molecular and Ionic Vapor Composition over CeI3 by Knudsen Effusion Mass Spectrometry

1Research Institute of Thermodynamics and Kinetics, Ivanovo State University of Chemistry and Technology, Ivanovo 153000, Russia
2Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland

Received 7 August 2016; Accepted 17 October 2016

Academic Editor: Alessandro Longo

Copyright © 2016 A. M. Dunaev et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The molecular and ionic composition of vapor over cerium triiodide was studied by Knudsen effusion mass spectrometry. In the saturated vapor over CeI3 the monomer, dimer, and trimer molecules and the negative ions I, , and were identified in the temperature range of 753–994 K. The partial pressures of CeI3, Ce2I6, and Ce3I9 were determined and the enthalpies of sublimation, (298.15 K) in kJ·mol−1, in the form of monomers (), dimers (), and trimers () were obtained by the second and third laws of thermodynamics. The enthalpy of formation, (298.15 K) in kJ·mol−1, of the CeI3 (), Ce2I6 (), and Ce3I9 () molecules and the () and () ions were calculated. The electron work function, =  eV, for the CeI3 crystal was evaluated.