Design of Velocity Map Imaging Spectrometer Equipped with a Mass Gate Discriminating Particular Photofragments
Table 1
Voltages applied to the respective electrodes and their dimensions with internal diameter .
Electrode
Voltages (V)
Dimensions (mm)
Base line value
Top line valuea
Shape
Thickness or length
Repeller, R
racetrack, e
1
—c,d
Ion Extractor, E
—
Racetrack, e
1
Tube Entrance, T
—
Racetrack, e
1
Drift Tube
—
cylinder,
340 (length)
Mass Gate, M
cylinder,
10 (length)
—c
Retarding Grid, fG2
—b,d
circle,
1
—c
aVoltage at the top line of the pulse waveform. Not applicable in the case of a DC operation.
bFor the PEX mode.
cFor the control experiments.
dFor the PEPICO mode.
eAxes of 50 × 66,
fSecond disk electrode of the ion reflector G.