Photoelectron Spectra and Molecular Properties: Real‐Time Gas Analysis in Flow Systems

For the analysis and optimization of numerous gas phase reactions in flow‐systems, photoelectron spectroscopy has proven most valuable. This real‐time measuring probe allows one to determine—with millimol quantities and within a few hours—the temperatures for different decomposition channels. Simultaneously, main products are characterized and, if need be, their yield can be improved. By careful performance of the experiment, short‐lived and/or reactive molecules such as P2, thioformaldehyde or silabenzene can be detected. PE‐spectroscopic gas analysis is of particular advantage in the search for heterogeneous catalysts; they can be tested within a day using gas mixtures of varying composition over the temperature range from 300 K to 1300 K. In addition, PE‐spectrometers are well‐suited for on‐line connection to computers; portable instruments for laboratory use are under development.