Enhanced production of ionic photofragments of Si(CH3)2Cl2 following core-to-valence excitation

• Published in: Surface science 2007-09, Vol.601 (18), p.3813-3817
• Main Authors: CHEN, J. M, LU, K. T, LEE, J. M, CHEN, C. K, HAW, S. C
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Physics
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/j.susc.2007.04.017

The state-selective positive-ion and negative-ion dissociation pathways for gaseous and condensed Si(CH3)2Cl2 following the Cl 2p and Si 2p core-level excitations have been characterized using synchrotron radiation. The Si excitation of Si(CH3)2Cl2 induces an enhancement of the Cl+ desorption yield in the condensed phase and the and yields in the gaseous-phase. The Cl-desorption yields are notably enhanced at the resonance at both Cl 2p and Si 2p edges. The resonant enhancement of Cl- yield occurs through the formation of highly excited states of the adsorbed molecules. These results provide an insight into the comprehensive understanding of the state-selective fragmentation of molecules via core-level excitation.