Page 1 of 1
Simple MS question
Posted: Sun Mar 19, 2006 7:10 pm
by just me
hello I have a simple question. Is the detector part of the mass spectrometer held under vacuum conditions. Some texts i have read say it is and some say it isnt !
Posted: Mon Mar 20, 2006 9:06 pm
by Earl
Depends on the type of mass spectrometer you are interested in.
Posted: Wed Mar 22, 2006 9:14 am
by Rafael Chust
Well, since what we are doing in MS is analyse ions generated by the ion source, the whole system should be held under vacuum to avoid interferences and allow the ions migrate to the detector.
The ionization chamber might be at lower vacuum - depending also the kind of ion source you have and which kind of system you are interfacing - but the detector is usually in the 10-6 mbar range.
Posted: Thu Mar 23, 2006 2:37 am
by james little
Maybe you are confusing mass spectrometers with ion mobility spectrometers?
see
http://www.chemistry.org/portal/a/c/s/1 ... 245d830100
Posted: Thu Mar 23, 2006 10:04 am
by Rafael Chust
Funny stuff!
I have heard about this technique in lab corridors but I did not knew they are actually in use!