Table 1

Characteristics of ion mobility spectrometer (IMS)

Ionisation source63Ni (510 MBq)
Electric field strength326 V/cm
Length of drift region12 cm
Diameter of drift region15 mm
Length of ionisation chamber15 mm
Shutter opening time10 μs – 1 ms
Shutter impulse time20, 100 ms
Drift gasSynthetic air (20.5% O2 (4.5), 79.5% N2 (5.0))
Drift gas flow100 … 300 ml/min
Temperature24°C (room temperature)
Pressure101 kPa (ambient pressure)
Multicapillary columnOV-5, polar
Column temperature30°C