Table 1.

Ion source settings of the mass spectrometer; the gas flows are in arbitrary flow units (afu.)

Item	Value
Cap temp	320 °C
Vap temp	250 °C
Spray voltage	2.4 kV
Skimmer	10 V
Ion sweep gas	10 afu.
Aux gas	10 afu.
Sheath gas	30 afu.
Tube lens offset	110 V