Why is My IMS Setup Failing to Detect TNT with a DC Corona Discharge Ion Source?

[matlabma]

I have built an IMS setup to detect explorsives such as RDX,PETN,etc. the setup can have the RDX and PETN spectra even in a much low concentration,but when for TNT detection,it fails to have any spectra.I want to know why?
using a DC corona discharge as an ion source

 

[Astronuc]

I have built an IMS setup to detect explorsives such as RDX,PETN,etc. the setup can have the RDX and PETN spectra even in a much low concentration,but when for TNT detection,it fails to have any spectra.I want to know why?
using a DC corona discharge as an ion source

Try searching Google with "Ion mobility spectrometry, IMS, TNT" and check the journal articles that appear.

 

[matlabma]

sorry,can not find the reasons,may be,something wrong in the drift tube,something in the tube quenching the ions?

 

[matlabma]

thank you GOD!I got the answer

 

[Zapitgood]

Would be nice of you to share the answer for us rabid researchers