標題: Dissociation dynamics of positive-ion and negative-ion fragments of gaseous and condensed Si(CH3)(2)Cl-2 via Si 2p, Cl 2p, and Cl 1s core-level excitations
作者: Chen, J. M.
Lu, K. T.
Lee, J. M.
Chen, C. K.
Haw, S. C.
電子物理學系
Department of Electrophysics
公開日期: 7-Dec-2006
摘要: The state-selective positive-ion and negative-ion dissociation pathways of gaseous and condensed Si(CH3)(2)Cl-2 following Cl 2p, Cl 1s, and Si 2p core-level excitations have been characterized. The excitations to a specific antibonding state (15a(1)(*) state) of gaseous Si(CH3)(2)Cl-2 at the Cl 2p, Cl 1s, and Si 2p edges produce significant enhancement of fragment ions. This ion enhancement at specific core-excited states correlates closely with the ion kinetic energy distribution. The results deduced from ion kinetic energy distribution are consistent with results of quantum-chemical calculations on Si(CH3)(2)Cl-2 using the ADF package. The Cl- desorption yields for Si(CH3)(2)Cl-2/Si(100) at similar to 90 K are notably enhanced at the 15a(1)(*) 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 insight into the state-selective ionic fragmentation of molecules via core-level excitation. (c) 2006 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2400229
http://hdl.handle.net/11536/11446
ISSN: 0021-9606
DOI: 10.1063/1.2400229
期刊: JOURNAL OF CHEMICAL PHYSICS
Volume: 125
Issue: 21
結束頁: 
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