| 摘要 |
PROBLEM TO BE SOLVED: To provide a mass analyzing system capable of accurately obtaining the data of a measuring object required by a user, with high efficiency. SOLUTION: In a tandem-type mass analyzing system, a database is searched in relation to the first parameter of precursor ions for MS<SP>1</SP>mass analysis, when the intensity of the peak ions of an MS<SP>1</SP>mass spectrum is a predetermined threshold or higher, when the candidate of precursor ions for MS<SP>2</SP>mass analysis is selected to determine whether the ions are stored in the data base. When the intensity of the peak ions of the MS<SP>1</SP>mass spectrum is lower than the predetermined threshold, the database is searched in relation to a second parameter that is smaller than the first parameter, to determine whether the peak ions are stored in the database and the ions that are not stored in the database are selected as the candidate of the precursor ions for the MS<SP>2</SP>mass analysis. COPYRIGHT: (C)2008,JPO&INPIT
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