Photoionization and Electron Detachment

Photoionization and Electron Detachment.—Photoelectron spectroscopy is not within the scope of this volume, but some papers on photoionization which may be of some interest are listed here. Several theoretical treatments of photoionization in atoms and small molecules have appeared.213 Photoionization in the rare gases,214 atomic hydrogen,215 alkali-metal and alkaline-earth atoms,21 magnesium atoms,217 group II atoms,218 mercury atoms,219 molecular hydrogen,220 several polyatomic molecules,221 and solvated electrons 222 has been discussed. Multiphoton ionization in the rare gases,223 benzene,224 and in molecular crystals has also been discussed.225  

Electron photodetachment [process (3)] experiments are of interest in that they can provide information regarding the electron affinities of the A species. For 

Photodetachment thresholds have recently been measured for alkali-metal negative ions (including Li, Na-, and K-),228 yielding results for the electron affinities of 0.611, 0.539, 0.497, 0.490, and 0.470 eV for Li, Na, K, Rb, and Cs 

15 and 0.62 eV, respectively. Diazines and s-triazine were shown to have positive electron affinities, i.e. the negative ions are more stable than the parent species. Photoionization measurements have been made on the heat of formation of allyl cations.239 

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