Russian Journal of Physical Chemistry A

, Volume 83, Issue 2, pp 158–166 | Cite as

The molecular and ionic sublimation of holmium tribromide

  • M. F. ButmanEmail author
  • L. S. Kudin
  • V. B. Motalov
  • A. S. Kryuchkov
  • A. E. Grishin
  • K. W. Krämer
Chemical Thermodynamics and Thermochemistry


The molecular and ionic composition of vapor over holmium tribromide was studied by high-temperature mass spectrometry under the conditions of sublimation from a Knudsen effusion cell and from the open single crystal surface. The partial pressures of HoBr3 and Ho2Br6 in saturated vapor and the ratio between their sublimation coefficients under free vaporization conditions were determined. The intensities of lines in the electron impact mass spectra and their temperature dependences were different under Knudsen and Langmuir conditions, which was evidence of superthermal vibrational-rotational excitation of molecules sublimed from the open surface. The enthalpies and activation energies of sublimation of HoBr3 crystals as monomers and dimers were calculated. The emission of HoBr 4 and Ho2Br 7 negative ions was observed under both sublimation conditions. Ion-molecular equilibria in the LaBr3-HoBr3 system were studied. The enthalpies of formation of the HoBr3 and Ho2Br6 molecules and HoBr 4 and Ho2Br 7 negative ions in the gas phase were calculated.


Saturated Vapor Pressure Holmium Tribromide Electron Impact Mass Spectrum Appearance Energy 
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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • M. F. Butman
    • 1
    Email author
  • L. S. Kudin
    • 1
  • V. B. Motalov
    • 1
  • A. S. Kryuchkov
    • 1
  • A. E. Grishin
    • 1
  • K. W. Krämer
    • 2
  1. 1.Ivanovo State University of Chemical TechnologyIvanovoRussia
  2. 2.Bern UniversityBernSwitzerland

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