Fundamental Studies of Laser Ignition and Kinetics in Reactive Gases
Abstract
Laser ignition experiments involving the hydrogen atom 2-photon resonance at 243, nm have been conducted and show an interesting isotope wavelength dependence. Figure shows the ILE dependence for the ignition of H2/O2 (curve a) and D2/O2 (curve b) using a tunable laser near 243 nm. The plots clearly show a wavelength shift which corresponds to 22 cm-1 at the two-photon level. This is exactly the energy difference in the n=2 excited state for the two different isotopes. Previously, we observed a similar wavelength dependence for the formation of microplasmas in flows of pure H2 and D2 gases. Figure 2 shows the ignition ILE dependence on equivalence ratio for H2/O2 and D2/O2 with the laser set at the corresponding minimum wavelength points which are the wavelengths for maximum two-photon excitation. As can be seen, the two curves are basically alike as would be expected for these two fuel gases whose flame chemistry is quite similar.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1991
- Accession Number
- ADA241463
Entities
People
- A. W. Miziolek
- B. E. Forch
Organizations
- Ballistic Research Laboratory