2003 Fiscal Year Final Research Report Summary
Dissociation of neutral intermediates by using charge inversion mass spectrometry
| Project/Area Number |
13640515
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
HAYAKAWA Shigeo Osaka Prefecture University, College of Integrated Arts and Sciences, Associate Professor, 総合科学部, 助教授 (00156423)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Charge Inversion / Mass spectrometry / Electron transfer collision / Dissociation of neutral species / Neutral Intermediate / Radical / Alkali metal targets |
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| Research Abstract |
A charge inversion mass spectrometry using alkali metal targets has been developed which produces clearer differentiation of hydrocarbon isomers than collision activated dissociation (CAD). In charge inversion MS, mass-selected positive ions are made to collide with an alkali metal target, and the resulting negative ions formed upon two-electron transfer are mass-analyzed. The internal energy deposition of the charge inversion indicates that dissociation occurs in the energy-selected neutrals formed via near-resonant neutralization. The relative peak intensity in the charge inversion spectra for some hydrocarbons depends strongly on the alkali metal target used, indicating the importance of internal energy in the dissociation of the excited neutral intermediates. These results demonstrate the utility of the charge inversion MS as a technique for the investigation of the dissociation of energy-selected neutral intermediates and for isomeric differentiation.
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