Alkali Halide Vapors. Structure, Spectra, and Reaction by P. Davidovits

By P. Davidovits

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And Hengstenberg, D. (1967). J. Phys. Chem. 71, 3337. , and Luchsinger, E. B. (1966). J. Phys. Chem. 70, 276. Hill, T. L. (1955). J. Chem. Phys. 23, 617. , Stitch, M. , and Townes, C. H. (1954). Phys. Rev. 96, 629. , and Norris, W. G. (1961). J. Chem. Phys. 34, 1071. , and Rice, S. A. (1957). J. Chem. Phys. 26, 618. , and Stranski, I. N. (1957). Z. , Kristallchem. 109, 184. Knudsen, M. (1909). Ann. Phys. {Leipzig) 28, 999. , and Hughes, V. W. (1959). In "Encyclopedia of Physics" (S. ), Vol. 37/1, p.

As Table I shows, several materials make satisfactory containers for alkali metals. In particular, stainless steel is not attacked by them up to a temperature of 1175 K. On the other hand, halogen molecules react with many materials, particularly when heated to the temperatures needed to produce halogen atoms by thermal dissociation. , 1977). For F atoms, graphite is too reactive for use as a container, but nickel has been found to be satisfactory. II. Production of Alkali Halide Vapors The vapor pressures of the alkali halides are so low at room temperature that the solids must be heated at least to about 1000 K to yield enough vapor for most experiments with these salts.

All rights of reproduction in any form reserved. ISBN 0-12-204250-6 34 E. F. Greene tures which vary from 990 K and 1444 K for LiF to 1341 K and 1977 K for NaF, respectively, with all the otherst falling in the range between these limits. Thus, for most experiments that are done with vapors of the alkali halides, the experimenter needs to heat the source for the salt to temperatures at least as high as 1000 K. Usually this heating is done in vacuum to (1) exclude air, which might react with the material of the source, or other contaminants such as water vapor, which can cause hydrolysis of the salts; and (2) reduce the power required for the source by providing good thermal insulation.

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