Re: why there are fragments in MS when using ESI or APCI /MS

sorry that I haven't made it clear about my expeiment condition:

   I study taxane with a Finnigan Lcq Advantage; the flow rate is 0.8
ml/ min,the ion source condition is listed below
  
                              ESI                         APCI
                        
Spray Voltage(kv)             4.5                          5
Capillary Temp(degree)        350                          200 
Capillary Voltage(v)          46                           5
Tube lens Offset(v)           55                           30
Vaporizer Temp(degree)                                     480