04328420 is referenced by 34 patents and cites 3 patents.

A tandem quadrupole mass spectrometer system in which an AC-only section is close coupled with a standard AC-DC section with the rods of the two sections closely longitudinally adjacent each other. The rods of the AC-only section are of open structure, formed by thin wires, to allow gas to be introduced into the system and to escape through the open structure rods. The system is particularly suited for use with a tandem quadrupole system consisting of three sections, namely an AC-DC section, an AC-only section, and an AC-DC section all close coupled, with a target gas introduced into the AC-only section to induce CID of ions traveling through the system. In one arrangement the rods of the AC-only section have solid center portions between which the target gas is introduced, and open structure end portions through which the target gas may flow away so that little of it enters the end AC-DC sections. In another embodiment, gas is beamed directly through a short open structure section by placing an appropriate gas dynamic beam forming device such as a collimated hole structure or a gas dynamic free jet on one side and an appropriate vacuum pumping arrangement on the other.

Title
Tandem mass spectrometer with open structure AC-only rod sections, and method of operating a mass spectrometer system
Application Number
6/173217
Publication Number
4328420
Application Date
July 28, 1980
Publication Date
May 4, 1982
Inventor
John B French
4 Thornbank Rd., Thornhill, Ontario
CA
Agent
Rogers Bereskin & Parr
IPC
B01D 59/44
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