26 



Ql 



Q2 



Q3 



(a); 



2 



^ 



^ 



Ql 



Q2 



Q3 



(b); 



Ql 



Q2 



Q3 



(c); 



Figure 1-2 Single-stage scan modes with a tandem quadrupole mass 

 spectrometer set for (a) Ql full mass spectrum, (b) Q3 full mass spectrum, and 

 (c) selected ion monitoring using Ql. 



