Threshold photoelectron photoion coincidence spectroscopy

Similar values have been obtained for AHffMesSi ) from two independent studies. The bond dissociation enthalpy DHfMeaSi-SiMea) = 332 +12 kJ moC was obtained from a kinetic study on the very low pressure pyrolysis of hexamethyldisilane and the enthalpy of formation of trimethylsilyl ion, AHf (MeaSi ) = 617.3 + 2.3kJmor, was determined using threshold photoelectron-photoion coincidence spectroscopy (TPEPICO). Both data are related to AHf°(Me3Si ). 

Davalos, J. Z. Baer, T. Thermochemistry and Dissociative Photoionization of Si(CH3)4, BrSifCITjlj, ISifCEIjlj, and SijCCElj) Studied by Threshold Photoelectron-Photoion Coincidence Spectroscopy/. Phys. Chem. A 2006, 110, 8572-8579. 

TPEPICO threshold photoelectron photoion coincidence spectroscopy... 

Photoionization has a number of advantages over electron impact ionization, such as greater sensitivity and thresholds that are easier to define. In coincidence photoelectron techniques (e.g., photoelectron photoion coincidence spectroscopy, PEPICO, and threshold photoelectron photoion coincidence spectroscopy, TPEPICO), the photoelectron and the photoion formed in the ionization process are detected simultaneously, thus providing information on the nature and energies of the ionized products. ... 

This article is centred on one of the most important molecular spectroscopic applications of photoionization. First, conventional photoelectron spectrometers based on the pioneering work of Turner, Vilesov and Siegbahn are reviewed, the basic building elements are shown and the principles of operation are discussed. Besides the conventional photoelectron experiment, threshold analysis and photoelectron-photoion coincidence spectroscopy as well as conceptually new techniques related to laser photoionization are discussed briefly. 

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