MS / MS type mass spectrometry method and MS / MS type mass spectrometer

摘要

When conducting MS / MS analysis on multivalent ions derived from the target component, an analyst determines the mass value m of the desorbed fragment_LossAnd the valence number z of the desorbed fragment_Loss, The valence number z of the precursor ion_Prec, And valence number z of the product ion_Prod(20), the valence calculating section (221) calculates the valence of z_Prec= Z_Prod+ Z_LossBased on the relationship of non-input valence z_PrecAlso z_ProdIs calculated. When the MS / MS analysis is started, the precursor ion m / z setting section (222) calculates m / z = M (m / z) of ions to be passed through the front quadrupole mass filter_Prec, And the passing product ion m / z calculating unit (223) sets the above M_Prod, M_Loss, Z_Prec, Z_Prod, M_Prod= (M_Prec z_Prec-m_Loss) / Z_ProdM / z of the product ion to be passed through the post-quadrupole mass filter (16) is applied to m / z = M_ProdIs calculated. Thus, even when the desorbed fragment is not neutral, the mass is m_LossAnd the valence is z_Loss, It is possible to investigate a pair of precursor ions and product ions such that a specific charged fragment is detached.