| Autor: |
J. J. ter Meulen, R Rogier Evertsen, NJ Nico Dam, Angela Staicu |
| Rok vydání: |
2001 |
| Předmět: |
|
| Zdroj: |
ROMOPTO 2000: Sixth Conference on Optics. |
| ISSN: |
0277-786X |
| Popis: |
The spectroscopic detection of NO2 has been investigated in the visible spectral range by laser induced fluorescence (LIF) and cavity ring down spectroscopy (CRDS). NO2 mixtures with air or argon at different pressures have been studied with LIF by excitation at 532 nm and detection in the range 550-580 nm. Collisional quenching and vibrational energy transfer appear to limit the application of LIF to sub-atmospheric pressures. Therefore, flow samples of NO2 in dry air at atmospheric pressure in the concentration range of 0.1 ppm to 15 ppm have been studied by CRDS. The absorption cross section of NO2 in the range between 437 nm and 450 nm has been determined and compared to literature. The sensitivity of the CRDS system was estimated to be 50 ppb. The effect of elevated temperatures on the absorption coefficient was examined for temperatures of 377 K and 433 K. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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