Development of a Portable Single Photon Ionization-Photoelectron Ionization Time-of-Flight Mass Spectrometer

Table 1

Typical parameters of the portable time-of-flight mass spectrometer.

Parameters	SPI mode	PEI mode
Pressure inside of ion source	1.25 Pa	1.25 Pa
Electrode 1	20 V	22.5 V
Electrode 2	17 V	21 V
Skimmer	5 V	−45.5 V
Electrode 3	−20 V	9 V
Electrode 4	−120 V	−120 V
Electrode 5	40 V	0 V
VUV lamp voltage	−1400 V	−1400 V
Repeller voltage	400 V	400 V
Accelerator	1800 V	1800 V
Reflector 1	1000 V	1000 V
Reflector 2	420 V	400 V
MCP detector	2600 V	2600 V
Pressure inside of mass analyzer	5 × 10^−5 Pa	5 × 10^−5 Pa