| Abstract
| - The ionic fragmentation following B 1s and C 1s excitation of three isomeric carborane cage compounds[closo-dicarbadodecaboranes: orthocarborane (1,2-C2B10H12), metacarborane (1,7-C2B10H12), and paracarborane(1,12-C2B10H12)] is compared with the energetics of decomposition. The fragmentation yields for all threemolecules are quite similar. Thermodynamic cycles are constructed for neutral and ionic species in an attemptto systemically characterize single-ion closo-carborane creation and fragmentation processes. Lower energydecomposition processes are favored. Among the ionic species, the photon-induced decomposition is dominatedby BH+ and BH2+ fragment loss. Changes in ion yield associated with core to bound excitations are observed.
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