| 摘要 |
<p>A mass spectrometer is disclosed comprising: a first ion trap or ion guide 2; a single ion mobility spectrometer or separator stage 3, arranged to separate ions according to their ion mobility or rate of change of ion mobility with electric field strength; and a second ion trap or ion guide 4 arranged downstream of the ion mobility spectrometer or separator 3. In a mode of operation, ions from the second ion trap or ion guide 4 are passed back upstream, through the ion mobility spectrometer or separator 3, to said first ion trap or ion guide 2. Ions emerging from the ion mobility spectrometer 3 may be accelerated so that said ions fragment of react upon entering said first ion trap or ion guide 2 and/or said second ion trap or ion guide 4.</p> |
