| 摘要 |
In a tandem mass spectrometry system (100), a first mass analyzer (108) filters parent ions (132) using a wide mass passband with a narrow rejection notch defined according to a modulation format. A wide mass range of parent ions is transmitted to an ion fragmentation device (112). Daughter ions produced thereby are transmitted to a second mass analyzer (116) to produce a daughter ion mass spectrum. The modulation of the measured daughter ion mass spectrum, when correlated with the passband modulation of the first mass analyzer (108) (i.e., parent ion spectrum), allows definitive identification of each daughter mass peak with the appropriate parent ion. Due to the wide mass passband, the ion detector signal is in proportion to the increased ion flux passed by the first mass analyzer (108). |
