ISSN:
0951-4198
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Physik
Notizen:
The advantages offered by the scanning facility of a multisector hybrid mass spectrometer of E1BE2qQ geometry, with software featuring an ‘experimental design’ function, are used to elucidate the origin of an artefact observed at m/z 290.8 in the linked scan spectrum at constant B/E of the m/z 299 ion of N,N-bissalicylidene 1,2-phenylenediamine, when performed using a forward geometry (EB) instrument. A previously proposed explanation, whereby the artefact peak was thought to originate from a fragmentation in the first field-free region, could not be verified by repeating the scan using an instrument of E1BE2qQ geometry, where E1 and E2 were linked during the scan at constant B/E. Several different scans were performed using an ‘experimental design’ scanning function, which allows analyzers to be scanned and linked by means of user-defined relationships. Thus, a mass-analysed ion kinetic energy (MIKE) (E2) scan, with E1 set to a value of 0.9725E0, revealed a peak at a value of 0.9462E0 which was subsequently determined to be due to an ion with a mass-to-charge ratio of 299, by using the quadrupole mass filter. A recently proposed graphical method, that allows the field values at which the artefact ion is transmitted to be plotted three dimensionally on a cube, illustrates that while the peak will appear in the spectrum obtained using a linked scan at constant B/E using an EB instrument, this will not be the case with an EBE geometry instrument. The EBE arrangement shows that the interference peak at m/z 290.8 appears to be the result of the transition of a higher-mass ion within the first electrostatic sector.
Zusätzliches Material:
9 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/rcm.1290091005
