Temperature dependence of CH3I self-broadening coefficients in the nu(6) fundamental

Temperature dependence of methyl iodide self-broadening coefficients in the fundamental nu(6) band is evaluated theoretically by the use of a semi-classical and a semi-empirical approaches in the range 200-400 K recommended for HITRAN. In the absence of not-room-temperature measurements, comparisons are performed solely between line-width sets computed by the two methods at some fixed temperatures. Traditional temperature exponents as well as parameters of the recently suggested double power law [JQSRT 2018;217:440-52] (going beyond the considered temperature range) are determined for (J, K)-lines with 0 <= J <= 70, K <= 20 requested by spectroscopic databases. Because of the negligible vibrational dependence, these data can be safely used for other perpendicular and parallel bands studied in atmospheric applications. (C) 2019 Elsevier Ltd. All rights reserved.