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

By P. Davidovits

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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.

4. Triple Beam Experiments Many experiments require alkali halide molecules in highly excited rotational and vibrational levels of the ground electronic state. However, to make even modest amounts of these molecules (MXt) is disappointingly difficult. Simple heating of a gas at any but very high pressures leads to the formation of atoms rather than molecular excitation. This is due to the dominant effect of the increase of entropy on dissociation. 75 Torr) the vibrational state excited by \D has a population only 10"10 of that of the ground 46 E.

C , and Porter, R. F. (1959). J. Chem. Phys. 30, 283. Searcy, A. W. (1970). In "Chemical and Mechanical Behavior of Inorganic Materials" (A. W. Searcy, D. V. Ragone, and U. ), Ch. 6. Wiley (Interscience), New York. Searcy, A. , and Freeman, R. D. (1954). J. Am. Chem. Soc. 76, 5229. Searcy, A. , and Freeman, R. D. (1955). J. Chem. Phys. 23, 88. Sense, K. , Snyder, M. , and Clegg, J. W. (1954a) J. Phys. Chem. 58, 223. Sense, K. , Snyder, M. , and Filbert, R. , Jr. (1954b). J. Phys. Chem. 58, 995.

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