Linked scan at constant B/E
|Linked scan at constant B/E|
A linked scan at constant B/E may be performed on a sector instrument that incorporates at least one magnetic sector plus one electric sector. It involves scanning the magnetic sector field-strength (B) and the electric sector field-strength (E) simultaneously, holding the accelerating voltage (V) constant, so as to maintain the ratio of the two fields strengths which transmit main-beam ions of predetermined mass-to-charge ratio. These pre-selected main-beam ions are the precursor ions whose fragment-ion spectrum is required. The fragmentation reactions observed occur in a field-free region traversed before the two sectors scanned in this way. This term "B/E linked scan" is not recommended; it may suggest that the ratio B/E varies during the scan.
|Considered between 2004 and 2006 but not included in the 2006 PAC submission|
|This is an unofficial draft definition presented for information and comment.|
Orange Book Entry
This can be performed with a sector instrument incorporating at least one magnetic sector and one electric sector. The magnetic sector field strength, B, and the electric sector field strength, E, are scanned simultaneously, while holding the accelerating voltage, V, constant, so as to maintain the ratio B/E constant. This constant value is determined by the ratio of the two field strengths required to transmit main-beam ions of predetermined mass/charge ratio. These preselected main-beam ions are the precursor ions whose fragment ion spectrum is required. The term B/E linked scan is not recommended.