Time-resolved LIF of OH(A 2Σ+, ν′=1 and ν′=0) in atmospheric-pressure flames using picosecond excitation
✍ Scribed by Malte Köllner; Penelope Monkhouse; Jürgen Wolfrum
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 474 KB
- Volume
- 168
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Time-resolved fluorescence measurements are reported for the OH radical in premixed, laminar atmospheric-pressure flames, following excitation of the u' = 1 and v' 30 levels of the A rE+ state. OH radicals were excited using a picosecond dye laser system based on the distributed feedback principle. Fluorescence was detected with a gated streak camera coupled to a CCD camera and temporal analyser. For v' =O excitation, a very weak dependence on lifetime was observed with initially excited rotational level N' in the range N' = I to 15. In the case of v' = 1 excitation, the lifetime increased by up to 15% in the range N' =5 to 14. The stoichiometry range 0.8-1.26 was reinvestigated, with the improved precision of the present data, a 13% decrease in lifetime could be observed over this range.