Mass Spectrometric Investigation of Barium Iodide and Caesium Iodide Vaporizations

Abstract

A MASS spectrometer (radius, 3 in. 45° sector) was used to examine Knudsen cell effusates1. Cylindrical graphite cells had orifice-to-evaporant surface area ratios of approximately 0.03 and were heated by conduction from a resistance furnace and by radiation from a grid above the furnace. The grid was necessary for maintaining axial temperature uniformity in the absence of radiation shielding2. Temperature was measured with a thermocouple attached to the cell base. A movable defining slit between the grid and water-cooled ion-source base made background correction of the ion signals possible; an electron multiplier followed the collector slit. Ionizing electron energies ranged from 7 to 20 eV. Repellers were kept at block potential and spectra were magnetically scanned. Vapour-pressure data (ion signals) were taken at random with respect to temperature; isotopic corrections of ion signals were made when necessary. Each experiment involved a fresh sample.

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References

  1. 1

    Inghram, M. G., and Drowart, J., in Proc. Intern. Symp. High Temperature Technology, 219 (McGraw-Hill Book Company, New York, 1960).

  2. 2

    Norman, J. H., Winchell, P., and Staley, H. G., J. Chem. Phys., 41, 60 (1964).

  3. 3

    Stull, D. R., and Sinke, G. C., Thermodynamic Properties of the Elements (Amer. Chem. Soc., Washington, D.C., 1960).

  4. 4

    Otvos, J. W., and Stevenson, D. P., J. Amer. Chem. Soc., 78, 546 (1956).

  5. 5

    Inghram, M. G., Hayden, R. J., and Hess, D. S., U.S. Nat. Bur. Stand. Circ., 522, 257 (1953).

  6. 6

    Brewer, L., Somayajulu, G. R., and Brackett, E., Chem. Rev., 63, 111 (1963).

  7. 7

    Berkowitz, J., and Chupka, W. A., J. Chem. Phys., 29, 653 (1958).

  8. 8

    Friedman, L., J. Chem. Phys., 23, 477 (1955).

  9. 9

    Brewer, L., and Brackett, E., Chem. Rev., 61, 425 (1961).

  10. 10

    Drowart, J., and Honig, R. E., J. Phys. Chem., 61, 980 (1957).

  11. 11

    Gaydon, A. G., Dissociation Energies and Spectra of Diatomic Molecules (Chapman and Hall, London, 1953).

  12. 12

    Akishin, P. A., Gorokhov, L. N., and Sidorov, L. N., Dokl. Akad Nauk S.S.S.R., 135, 113 (1960).

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WINCHELL, P. Mass Spectrometric Investigation of Barium Iodide and Caesium Iodide Vaporizations. Nature 206, 1252 (1965). https://doi.org/10.1038/2061252a0

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