Study of the Heterocomplexes in the Vapor of the Na‐Sn‐Br‐I System and Their Relevance for Metal Halide Lamps

The vapor of the Na‐Sn‐Br‐I system was investigated under equilibrium conditions in the temperature range between 623 and 913 K by the use of Knudsen effusion mass spectrometry with a two‐compartment Knudsen cell. The gaseous species , , , , , , , , , , , and were detected in the vapor. The enthalpy and entropy changes of the reactions , , and resulted as , for reaction Eq. 1, , for reaction Eq. 2, and , for reaction Eq. 3. Gas‐phase equilibria important for the development of metal halide lamps were computed using the results of this work and ancillary data.