| 摘要 |
A SIFT or SIFDT apparatus in which the upstream quadrupole and the downstream quadrupole are housed within a single evacuated chamber ( 20 ) with the upstream quadrupole ( 22 ) being ( 24 ). connected to the downstream quadrupole ( 29 ) by a curved flow tube sections by an electrostatic shield ( 27 ) which shields the upstream quadrupole and source connection from the downstream quadrupole and detector.
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