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| Titel |
Development of a continuous-wave quantum cascade laser instrument for atmospheric measurements of HONO near 1255 cm-1 |
| VerfasserIn |
Xiaojuan Cui, Weidong Chen, Eric Fertein, Wenqing Liu, Yujun Zhang, Fengzhong Dong |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037975
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| Zusammenfassung |
| Gaseous nitrous acid (HONO), as an important hydroxyl (OH) free radical source in the
atmosphere by photolysis at dawn, plays a very important role in the atmospheric chemistry
of irradiated mixtures of VOC and NOx. It is also an important precursor for OH radicals in
simulation chambers. Concentration measurement of atmospheric HONO requires high
sensitivity, good temporal and spatial resolution. Tunable diode laser spectrometry (TDLS)
provides advantage in terms of sensitivity (due to the laser source) and spatial resolution (due
to point sampling) in comparison with the currently used spectroscopic instruments (FTIR
and DOAS). In this paper, we report on the development of a TDLS instrument
for atmospheric HONO detection, based on a continuous wave, room temperature
operation quantum cascade laser (QCL) emitting at about 1254.7 cm-1 at 20 -C
with an output power of up to 35 mW. Experimental details will be presented and
discussed. |
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