Diode laser absorption spectroscopy measurement of linestrengths and pressure broadening coefficients of the methane 2v3 band at elevated temperatures

A diode laser sensor based on absorption spectroscopy has been developed for the measurement of spectroscopic parameters in the R(3) and R(4) manifolds of 2nu(3) band of CH4. Individual linestrengths of each transition are determined for a range of temperatures. In addition, collision-broadened half-widths for CO2, N-2, H2O, CH4, and CO collision partners are measured as a function of temperature and pressure for these strongly overlapped transitions. From this, temperature dependence of the collision half-width for each collision partner is determined. Using a new method for calculation of collisional broadening at high temperatures for strongly overlapped transitions makes these transitions accessible for spectroscopy. (C) 2004 Elsevier Inc. All rights reserved.