Diode laser absorption spectroscopy measurement of linestrengths and pressure broadening coefficients of the methane 2ν3 band at elevated temperatures |
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| Authors: | Mohammadreza Gharavi |
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| Affiliation: | Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, USA |
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| Abstract: | 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 2ν3 band of CH4. Individual linestrengths of each transition are determined for a range of temperatures. In addition, collision-broadened half-widths for CO2, N2, 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. |
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| Keywords: | CH4 spectroscopy Absorption linestrength Collisional broadening Temperature dependence of the collisional half-width Voigt function Tunable diode laser absorption spectroscopy Combustion diagnostics |
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