1983
DOI: 10.1016/0020-7381(83)85010-4
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Analysis of doubly-charged ion reactions and consecutive two-step degradation processes by means of metastable peak mapping

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Cited by 7 publications
(2 citation statements)
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“…The current approach is related to methods originally developed for the automated mapping of metastable ions produced in the field-free regions of magnetic sector instruments . The mapping was originally done by fast magnetic field scanning while the electric sector field was stepped in small intervals or, alternatively, by fast electric field scanning combined with slow magnetic sector field scanning. , These early attempts recognized the unique capabilities of the product ion mapping for the characterization of complex mixtures, but they did not permit accurate precursor ion selection and accurate product ion mass assignment due to the ion optics limitations of the linked scans. , The current work presents an advancement over the early metastable ion mapping methods by using the double-focusing properties of the magnetic sector (MS-1) to accurately select precursor ions and the oa-TOF (MS-2) to acquire product ion spectra with better that unit mass resolution. The routine application of the approach and typical results obtained from the analysis of representative petroleum systems are presented below.…”
Section: Resultsmentioning
confidence: 99%
“…The current approach is related to methods originally developed for the automated mapping of metastable ions produced in the field-free regions of magnetic sector instruments . The mapping was originally done by fast magnetic field scanning while the electric sector field was stepped in small intervals or, alternatively, by fast electric field scanning combined with slow magnetic sector field scanning. , These early attempts recognized the unique capabilities of the product ion mapping for the characterization of complex mixtures, but they did not permit accurate precursor ion selection and accurate product ion mass assignment due to the ion optics limitations of the linked scans. , The current work presents an advancement over the early metastable ion mapping methods by using the double-focusing properties of the magnetic sector (MS-1) to accurately select precursor ions and the oa-TOF (MS-2) to acquire product ion spectra with better that unit mass resolution. The routine application of the approach and typical results obtained from the analysis of representative petroleum systems are presented below.…”
Section: Resultsmentioning
confidence: 99%
“…The study of multiply-charged ions 1,2 has always been a subject of interest in mass spectrometry, since it can give information about ion structures, through the measurement of the kinetic energy released upon charge separation reactions. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] The first example presented in the literature 6 refers to the fragmentation of the doubly-charged benzene molecular ion, where the kinetic energy (2.8 eV), released in the reaction C 6 H 6 2+ → C 5 H 5 + CH 3 + , corresponds to an intercharge distance of 5.14 Å. This distance is considerably larger than the one expected for a cyclic structure (2.8 Å), providing a strong indication for a linear configuration for the transition state.…”
Section: Introductionmentioning
confidence: 99%