| Autor: |
Aleš Svatoš, Jason B. Bialecki, Athula B. Attygalle, Josef Ruzicka, Najeh Kharbatia, Einar J. Stauber |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
Rapid communications in mass spectrometry : RCM. 20(15) |
| ISSN: |
0951-4198 |
| Popis: |
The ion observed at m/z 145 when product ion spectra of iodobenzoate anions are recorded using ion-trap mass spectrometers corresponds to the adduct ion [I(H 2 O)] - . The elements of water required for the formation of this adduct do not originate from the precursor ion but from traces of moisture present in the helium buffer gas. A collision-induced decomposition (CID) spectrum recorded from the [M-H] - ion (m/z 251) derived from 3-iodo[2,4,5,6- 2 H 4 ]benzoic acid also showed an ion at m/z 145. This observation confirmed that the m/z 145 is not a product ion resulting from a direct neutral loss from the carboxylate anion. 79 Bromobenzoate anions produce similar results showing an ion at m/z 97 for [ 79 Br(H 2 O)] - . The ion-molecule reaction observed here is unique to ion-trap mass spectrometers since a corresponding ion was not observed under our experimental conditions in spectra recorded with in-space tandem mass spectrometers such as triple quadrupole or quadrupole time-of-flight instruments. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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