发明名称 |
ISOLATION OF IONS IN OVERLOADED RF ION TRAPS |
摘要 |
In an RF quadrupole ion trap having electrodes to which RF voltages are applied, ions having m/z ratios outside of a predefined narrow range of charge-related masses m/z are removed from the trap by applying a DC voltage pulse to at least one of the trap electrodes to remove from the trap the ions with high values of charge-related masses. The DC voltage pulse is preferably applied in combination with a variation of the RF voltage amplitudes to simultaneously remove from the trap ions of low charge-related masses. The DC and RF voltage amplitudes are changed in such a manner that any excitation of ions having charge-related masses within the predefined range by frequency mixtures is avoided. |
申请公布号 |
US2012223222(A1) |
申请公布日期 |
2012.09.06 |
申请号 |
US201113037792 |
申请日期 |
2011.03.01 |
申请人 |
KAPLAN DESMOND ALLEN;BREKENFELD ANDREAS;GEBHARDT CHRISTOPH;HARTMER RALF;BRUKER DALTONIK GMBH |
发明人 |
KAPLAN DESMOND ALLEN;BREKENFELD ANDREAS;GEBHARDT CHRISTOPH;HARTMER RALF |
分类号 |
H01J49/22 |
主分类号 |
H01J49/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|