| 摘要 |
An ion filter for a mass spectrometer, the apparatus comprising an ion modifier 6; an ion selector 4 configured to select a subset of a sample of ions based on their mobility in a gas; and a controller configured to operate the ion modifier 6 in a first mode to modify the ions selected by the ion selector 4 to provide daughter ions, and configured to operate the ion modifier 6 in a second mode to output the ions selected by the ion selector 4; wherein the ion filter is adapted for providing output ions from the ion modifier 6 to an intake of a mass spectrometer. The ion selector 4 may be a drift chamber. The ion modifier 6 may be a mesh of electrodes subjected to radio frequency RF in a first mode. The ions may pass through the ion selector 4 and the ion modifier 6 in either order. An experimental run may comprise operating the modifier 6 in a first mode for a first subset of ions selected by the selector 4, and in a second mode for a second subset of ions. |
