IMPROVEMENTS IN OR RELATING TO SIFT-MS INSTRUMENTS

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 connected to the downstream quadrupole (29) by a curved flow tube (24). In a preferred form the interior of the chamber is divided into sections by an electrostatic shield (27) which shields the upstream quadrupole and source connection from the downstream quadrupole and detector.