Film sampling proton transfer reaction mass spectrometry
A technology of proton transfer reaction and membrane injection, which is applied in the direction of ion source/gun, parts of particle separator tubes, etc., to achieve the effect of lowering the detection limit
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[0033] Such as figure 1 As shown, it includes a hollow cathode ion source 2, a drift tube 5, an ion transmission area 7, a mass analyzer 8 and a membrane sampling system 9.
[0034] The hollow cathode ion source 2 has a water vapor inlet 1 at the front end and a water vapor outlet 3 at the back end. The present invention only takes the most commonly used hollow cathode ion source as an example, and there are other forms of ion sources, such as electron bombardment ionization sources, plane electrode DC discharge sources, radioactive ionization sources, light-induced ion sources and microwave plasma sources. In addition to using H produced by water 3 O + In addition to the parent ion, NH can also be used 4 + , NO + , O 2 + Wait.
[0035] The drift tube 5 has an inlet 4 for the object to be tested at the front end, and an exhaust port 6 at the rear end. The drift tube 5 is composed of metal ring electrodes separated by insulating rings, and resistors of the same r
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