Fragmentation threshold

The ionization and fragmentation thresholds can be obtained by the photoionization efficiency curves through the following sequence (i) the first exciting laser Qivi) is fixed on the Si Sq transition of the species of interest (ii) the laser intensity is lowered to about 1-10% of the initial fiuence to minimize the hv ... 

Example For the case of 4-methyl-1-pentene, the breakdown graph, the internal energy distribution from the photoelectron spectrum, and the 70 eV El mass spectrum are compared (Fig. 2.22). [99] From the fragmentation threshold to about... 

Spieler O., Kennedy B., Kueppers U., Dingwell D.B., Scheu B., and Taddeucci J. (2004) The fragmentation threshold of pyroclastic rocks. Earth Planet. Sci. Lett. 226,... 

Rost, J.M. and Heller, E.J. (1994). Ionization of hydrogen by positron impact near the fragmentation threshold. Phys. Rev. A 49 R4289-R4292. 

Properties of afomic and molecular states, the latter along the potential energy surfaces (PES) that are known up to their fragmentation thresholds, rather than at just the region of equilibrium geometries. These include rates of fransitions befween states. 

Regular ladders of doubly, triply, and quadruply excited states tending to fragmentation thresholds where the electronic geometry is symmetric... 

One common conceptual denominator of the various publications on resonance (nonstationary) states is the association of the appearance of a resonance with a quasi-localized single- or multi-particle wavepacket whose energy is above the fragmentation threshold. This means that, on resonance, there is an "inner" and an "outer" (asymptotic) component of the wavefunc-tion, each contributing in a different way to the intrinsic characteristics of the state and to the quantity which is measured. 

Unified theory and ab initio computation of the wavefunctions and spectra just below and just above the fragmentation threshold, with application to atoms... 

The review covers, apart from the methodology of solving the TDSE, the theory for the solution of the MEP in two broad subjects of modern research One which refers to isolated discrete and resonance states, and one which refers to the series of states just below and just above the fragmentation threshold. Thus, it is also concerned with the theory of the quantum defect and of related issues. The applications which are mentioned or are discussed briefly, involve either the ab initio computation of the time-resolved decay of autoionizing states, or, especially, prototypical TDMEPs of absorption of one or of many photons by atoms, by negative ions and by diatomics. In the latter case, we demonstrate how the multipolar interaction expressing the full atom-field interaction, (and not just the electric dipole approximation), can be incorporated into a practical computational methodology. 

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