Abstract
Linestrengths and lineshapes for 7H2O absorption transitions in the ν1+ν3 combination band near 1.4μm were measured at high resolution using tunable diode laser absorption. H2O- and N2-perturbed lineshapes were measured at 300–1300K and 2–760Torr and Voigt, Galatry, Rautian, and quadratic-speed-dependent-Voigt profiles were least-squares fit to measured spectra using a multi-spectrum fitting routine. Transitions with J″ of 6–18 were studied to highlight the importance of collisional resonance and illustrate how the best-fit lineshape parameters varied with J″. The accuracy of the Voigt profile decreased as J″ increased (especially for J=Kc doublets). For transitions in N2, the collisional-broadening temperature exponents varied from ≈0.8 to −0.4 (for the Voigt profile) as J″ increased and this behavior coincided with increasing speed-dependent collisional-broadening coefficients. The quadratic-speed-dependent Voigt profile was found to offer the best combination of accuracy and robust lineshape parameters; however, Rautian and Galatry profiles provided similar performance.
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