Multiphoton Photochemical and Collisional Effects during Oxygen Atom Flame Detection.
Abstract
A Nd:YAG pumped dye laser system was used to two-photon excite oxygen atoms at 225.6 nm in an atmospheric pressure CH4/N2o/N2 flame. Subsequent emission at 844.7 nm from the directly populated state, as well as a stronger emission at 777.5 nm due to the O(3p 3p to 3p 5p) collisional energy transfer process, was monitored. Two-photon resonant oxygen atom and hydrogen atom (656.3 nm) emissions were also observed in the absence of a flame. Closer examination revealed that the tightly focussed probe beam was producing these atoms by promoting multiphoton photolysis of the oxidizer, as well as fuel molecules. Thus, this type of laser diagnostic probe is potentially quite intrusive depending on the combustion region that is probed, as well as the laser energies used.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1984
- Accession Number
- ADA148783
Entities
People
- A. W. Miziolek
- M. A. Dewilde
Organizations
- Ballistic Research Laboratory