Table 1 Table of substances tested listing the respective molecular weights M, the diffusion coefficients D at 25 °C and 200 °C as well as the measurement instrument used and typical concentrations upstream the AGES of the respective substance.
Substance | Chemical Formula | M/u | D/cm2 s−1 @25 °C | D/cm2 s−1 @200 °C | Typical Upstream AGES Concentration | Measurement Instrument |
|---|---|---|---|---|---|---|
Water | H2O | 18.0 | 0.30 | 0.66 | 20000 ppm | LI-COR |
Nitric oxide | NO | 30.0 | 0.20 | 0.40 | 3000 ppm | SIDOR |
Oxygen | O2 | 32.0 | 0.20 | 0.40 | 21% | AlphaSense O2 A2 |
Carbon dioxide | CO2 | 44.0 | 0.15 | 0.31 | 100000 ppm | LI-COR |
Sulfur dioxide | SO2 | 64.1 | 0.13 | 0.25 | 100 ppm | SIDOR |
Ethanol | C2H5OH | 46.1 | 0.12 | 0.23 | 3000 ppm | FID |
Isopropanol | CH3CHOHCH3 | 60.1 | 0.10 | 0.20 | 3000 ppm | FID |
Toluene | C7H8 | 92.1 | 0.09 | 0.17 | 4000 ppm | FID |
Sulfuric acid | H2SO4 | 98.1 | 0.0834 | 0.18 | 7 × 108 molecules/cm3 | API-TOF |
α pinene | C10H16 | 136.2 | 0.07† | 0.13 | 4000 ppm | FID |
