Reaction threshold energies

Acronym Electron impact reaction Threshold energy (eV Reference ) Comment... 

The determination of the microcanonical rate coefficient k E) is the subject of active research. A number of techniques have been proposed, and include RRKM theory (discussed in more detail in Section 2.4.4) and the derivatives of this such as Flexible Transition State theory. Phase Space Theory and the Statistical Adiabatic Channel Model. All of these techniques require a detailed knowledge of the potential energy surface (PES) on which the reaction takes place, which for most reactions is not known. As a consequence much effort has been devoted to more approximate techniques which depend only on specific PES features such as reaction threshold energies. These techniques often have a number of parameters whose values are determined by calibration with experimental data. Thus the analysis of the experimental data then becomes an exercise in the optimization of these parameters so as to reproduce the experimental data as closely as possible. One such technique is based on Inverse Laplace Transforms (ILT). 

Ethane Formation. Our results (Table III) indicate that 45% of the C2Hg is produced by ion-molecule reactions. Threshold energy measurements (Table V) show that the ions involved are CH4+ and CH3+. Parent ion can contribute to C2HG by Reactions 4a and 8a followed by... 

Element Symbol Reaction Threshold energy (MeV) Half-life of product Main radiation emitted and its energy (MeV)... 

Guided ion-beam tandem mass spectrometric techniques have been used to measure reaction threshold energies for proton transfer in the endoergic reactions... 

Table VIII-1 Nuclear reaction for the determination of phosphorus. Interfering reactions. (Threshold energies in MeV)...

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