Dissociation dynamics of positive-ion and negative-ion fragments of gaseous and condensed Si(CH(3))(2)Cl(2) via Si 2p, Cl 2p, and Cl 1s core-level excitations.
The state-selective positive-ion and negative-ion dissociation pathways of gaseous and condensed Si(CH(3))(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(CH(3))(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(CH(3))(2)Cl(2) using the ADF package. The Cl(-) desorption yields for Si(CH(3))(2)Cl(2)Si(100) at approximately 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.
Chen
J M
JM
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, Republic of China. jmchen@nsrrc.org.tw
Lu
K T
KT
Lee
J M
JM
Chen
C K
CK
Haw
S C
SC
D002713:Chlorine / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D007477:Ions; D007700:Kinetics; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D011522:Protons; D012825:Silicon / Q000737:chemistry*; D013816:Thermodynamics
D005740:Gases; D007477:Ions; D009942:Organometallic Compounds; D011522:Protons; D002713:Chlorine; D012825:Silicon