New Techniques and Opportunities in High Temperature Mass Spectrometry

摘要

In the present discussion, emphasis is given to recent developments and remaining problems in the application of mass spectrometry to high temperature materials chemistry. Examples of application areas discussed include: Knudsen effusion mass spectrometry of gas-solid reactions, with equilibrium or kinetic control; high-pressure molecular beam sampling mass spectrometry of flames and laser-vapor-plumes, and transpiration mass spectrometry of gas- liquid-solid and ceramic-slag-salt systems. Certain maxims are examined, including use of ionization cross-section approximations. Evidence of departure from the key assumption of a temperature-independent electron impact process is given, including temperature-dependent parent-ion fragmentation and cross section behavior. Errors arising from the use of cross section additivity and electron energy-scaling approximations are also examined.