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| Titel: |
Ultrafine Aerosol Measurement Using a Condensation Nucleus Counter with Pulse Height Analysis |
| Auteur: |
Saros, M. T. Weber, R. J. Marti, J. J. McMurry, P. H. |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 25 (1996) nr. 2 pagina's 200-213 |
| Jaar: |
1996 |
| Inhoud: |
Photodetector pulse heights from an ultrafine condensation nucleus counter increase monotonically with particle size in the ∼ 2.7-15 nm diameter range. This relationship can be used to measure concentrations and size distributions of ultrafine aerosols. In this study, we investigated the sensitivity of size-dependent pulse heights to total particle concentration, absolute pressure (0.25-1 atmosphere), and particle composition (H2SO4, (NH4)2SO4, NaCl, and tungsten oxide). We found that pulse heights shifted significantly with pressure and slightly with concentration. Coincidence led to errors for concentrations exceeding 4 × 103 cm-3. Over the range of conditions investigated, however, the observed shifts in the pulse height voltage were independent of size. The pulse height method is particularly applicable to situations involving low ultrafine particle concentrations, such as are encountered in the remote troposphere. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 11 gevonden artikelen
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