Table 1.
Kinetic reaction constants and calibration results for different compounds according to PTR-MS measurements.
| Compound | m/z | kinetic rate constant (taken from reference [55]) |
calibration factor*) |
|---|---|---|---|
| benzene | 79 | 1.97·10-9 cm3 sec-1 | 0.95 |
| isoprene | 69 | 2.0·10-9 cm3 sec-1 | 2.26 |
| acetone | 59 | 3.9·10-9 cm3 sec-1 | 1.21 |
| methanol | 33 | 2.7·10-9 cm3 sec-1 | 0.69 |
| acetonitrile | 42 | 4.5·10-9 cm3 sec-1 | 1.24 |
*) The "calibration factor" is the factor used to correct concentrations which are initially determined using the kinetic rate constants as taken from reference [55]. The large "calibration factor" for isoprene is due to fragmentation of protonated isoprene (m/z 69) towards m/z 41.