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Coulomb Explosion Decomposition Following Inner Shell Photoexcitation of MX4 (M=C, Si, Ge, X=Cl, Br) by Electron-Ion and Ion-Ion Coincidence Methods in the Range 88 –1000 eV

등록일
2009년 8월 14일 14시 40분 56초
접수번호
1076
발표코드
34P84포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 <발표Ⅰ>
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
부봉현, 이재광1
충남대학교 화학과, Korea
1Department of Chemistry, University of Akron, United Arab Emirates
Dissociative multiple photoionization processes of MX4 (M=C, Si, Ge, X=Cl, Br) have been investigated in the valence and inner shell photoexcitation/ photoionization regions by time-of-flight (TOF) mass spectrometry coupled to synchrotron radiation. Several discrete resonances are observed below thresholds of some specific core levels. We have calculated the discrete resonance energies using the equivalent ionic core approximation method at the HF/6-311++G(d) level. The slow rises may correspond to the delayed onset phenomena in the atomic photoabsorption and photoionization. This is caused by centrifugal barrier effects which are increasingly important with increasing angular momentum quantum number l involved. For CBr4, contrast to the Br(3d) core excitation, the Br(3p,3s) core excitation led to the detection of ion pair Br2+ - Br+, and C+ -Br+ in significant yields. This indicates that local multiple ionization of the specifically excited bare Br atom follows fast dissociation of the bond between the central carbon atom and the core-excited Br atom.

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