Table 1.

System parameters of CIFI−TOFMS.

Ion Source	Parameters
vacuum ultraviolet lamp	1100 V; 0.55 mA
repulsion electrode (V1)	30 V
extraction electrode (V2)	25 V
voltage at the front end of the segmented quadrupole (V3)	20 V
the segmented quadrupole RF frequency and magnitude	2.1 MHz; 300 VP-P
voltage at the back end of the segmented quadrupole (V4)	15 V
Ion Transmission System	Parameters
the first differential vacuum orifice (S1)	13 V
RF-only quadrupole RF frequency, magnitude, and DC float	1.8 MHz; 280 VP-P; 8 V
the second differential vacuum orifice	5 V
the ion lens	−20 V; −50 V
TOF Mass Analyzer	Parameters
slit	2 × 8 mm
modulator	25 kHz frequency, ±480 V pulse voltage
accelerator	62.8 mm in length; −3800 V
drift region	468 mm in length
reflector	reflector 1, −200 V; reflector 2, 1020 V
microchannel plate detector	−4000 V