ISSN:
0951-4198
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Physik
Notizen:
Cyclic, high molecular weight perfluorocarbons (PFC's) are very electronegative, and can be detected by methane negative ion chemical ionization (NICI); however only molecular ions are detected. Electron ionization (EI) of PFC's, on the other hand, yields little or no molecular ion but very intense low mass fragment ions such as CF3+ (m/z 69), C3F5+ (m/z 131) and C4F7+ (m/z 181), which are not structurally characteristic. High-energy collisionally activated decomposition (CAD) of positive, molecular ions of perfluoro-1,3-dimethyladamantane yields important structural information by providing more intense high mass fragment ions. Fragments of the following formulae and abundances (in brackets): C5F11+ (100), C11F17+ (73), C7F9+ (67), C8F11+ (43), C4F7+ (26), C7F8+. (18), and CF3+ (14) are detected by this method.
Zusätzliches Material:
1 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/rcm.1290021005
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