Investigation of the Cars Spectrum of Water Vapor.
Abstract
The coherent anti-Stokes Raman spectrum of water vapor was measured and compared with CARS code calculations to facilitate diagnostics of this important combustion product. Measurements were made with mixtures of H2O and a diluent gas heated to 450-800K in a test cell at atmospheric pressure. The experimental spectra were computer fit to calculations to deduce H2O Raman linewidths. The self broadening coefficient was found to be 0.5 per cm/atm at 773K and to depend inversely on the temperature. N2 and CO2 broadening coefficients are comparable, essentially independent of temperature at 0.17 per cm/atm over this range. Measurements were also made in the post-reaction region of stoichiometric CH4-air flames at 1670 and 2070 K. The linewidth was inferred to be 0.24-0.25 per cm/atm in both flames. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1981
- Accession Number
- ADA105235
Entities
People
- J. A. Shirley
- Richard J. Hall
Organizations
- United Technologies Corporation