S 2p excitation and fragmentation of sulfur aggregates

Autor(en): Teodorescu, CM
Gravel, D
Ruhl, E
Stichwörter: ABSORPTION-SPECTRA; ARGON CLUSTERS; Chemistry; Chemistry, Physical; COINCIDENCE PEPIPICO TECHNIQUE; CORE-IONIZATION; DOUBLE PHOTOIONISATION; INNER-SHELL EXCITATION; K-EDGE; PHOTOELECTRON-SPECTROSCOPY; Physics; Physics, Atomic, Molecular & Chemical; POST-COLLISION INTERACTION; TRIPLE COINCIDENCE
Erscheinungsdatum: 1998
Herausgeber: AMER INST PHYSICS
Journal: JOURNAL OF CHEMICAL PHYSICS
Volumen: 109
Ausgabe: 21
Startseite: 9280
Seitenende: 9287
Zusammenfassung: 
Synchrotron radiation from the storage ring BESSY-I is used to excite the S 2p regime (150-190 eV) of sulfur aggregates S-n, n = 2-8. Valence states are identified in photoion yield spectra of mass selected S-n(+) cations in combination with extended Huckel calculations. Mass spectra, partial ion yields, and photoelectron-photoion-photoion (PEPIPICO) coincidence spectra an reported, yielding a consistent picture of massive decay processes occurring in the S 2p regime. PEPIPICO spectra especially give detailed information on the fragmentation mechanisms of doubly charged aggregates. It is shown that most cation pairs are formed via charge separation originating from S-8(++). We derive values for the kinetic energy releases in multistep fragmentations assuming that charge separation is driven by Coulomb explosion. (C) 1998 American Institute of Physics. [S0021-9606(98)00245-1].
ISSN: 00219606
DOI: 10.1063/1.477589

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