The influence of an initial excitation of a molecular vibrational mode on the photofragmentation process occurring in fragmentation processes in the fields of two lasers (IR + UV) is investigated theoretically. The problem is treated as a modified Franck-Condon transition into the continuum. The calculations indicate that an initial vibrational excitation can lead to higher fragmentation probabilities in agreement with experimental results.
A classification is proposed for the structures of CmC'm,A, compounds which contain anionic tetrahedron complexes formed with all the C' and A atoms, the C' atoms centering the tetrahedra, and with the C atoms outside the complex. The classification is based on the observation that compounds with these structures can be considered as general valence compounds, which permits the use of the generalized (8-N) rule. The parameters considered are: (a) VECA, the partial valence-electron concentration with respect to the anion A, calculated from the position of the elements in the Periodic Table; (b) AA(n/m') or C'C (this depends on the VECA value) which correspond to the average number of electrons
