Collisional broadening of rotation–vibration lines for asymmetric-top molecules. III. Self-broadening case; application to H2O

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Abstract
A semiclassical theory of asymmetric‐top molecule line broadening, developed in part I of this series of papers for linear perturbers, is extended to asymmetric‐top perturbers. This model has been successfully applied in part II to the broadening of H2O lines by N2, O2, and Ar. The present applications to the self‐broadening of H2O infrared and Raman lines in the 300–900 K range also show the quality of the model. Due to the high electrostatic forces involved in the H2O–H2O interaction, the short‐range anisotropic potential has little influence. Nevertheless, the need for a modeling of the trajectory is demonstrated, mainly in the case of high rotational quantum number lines.