| 摘要 |
PROBLEM TO BE SOLVED: To restrain reduction of signal strength of a mass spectrometer/spectrum of the mass spectrometer so that a primary fragment ion generated with photodissociation is secondarily dissociated. SOLUTION: An exciting laser beam for triggering photodissociation is irradiated on the center of a capturing zone A in an ion trap 1, and an exciting signal for making the fragment ion excite without exciting a precursor ion is applied on end cap electrodes 12 and 13. Dissociation of the precursor ion effectively starts by receiving irradiation of the exciting laser beam because the selected precursor ion is gathered in the vicinity of the center of the capturing zone A. The fragment ion dislocates an exciting beam irradiation zone B due to greater vibration so that the generated fragment ion is immediately excited with the exciting signal by an action of an exciting electric field. Thus, the fragment ion is hard to receive the exciting laser beam, and therefore, secondary dissociation of the fragment ion is hardly generated. COPYRIGHT: (C)2008,JPO&INPIT
|
