CH${}_3$I-oxygen line-broadening coefficients at 296 K are calculated for the ^RR, ^PR, ^RP, ^PP, ^RQ and ^PQ sub-branches of the ${\nu }_6$ band in a wide range of rotational quantum numbers ($0\le J\le 70$, $K\le 20$ by a semi-classical and a semi-empirical methods. The computed values compare very favourably with the available experimental data and therefore can be safely employed as estimates of broadening coefficients missing in databases for high $J$ and $K$. The theoretical data for CH${}_3$I-O${}_2$ are further combined with the previously calculated room-temperature CH${}_3$I-N${}_2$ line-broadening coefficients to obtain the air-broadening values required for atmospheric applications. The calculated results demonstrate an excellent consistency with both existing sets of CH${}_3$I-air measurements. As the vibrational dependence of CH${}_3$I oxygen-broadening coefficients is shown to be small, similarly to the nitrogen-broadening case, the CH${}_3$I-O${}_2$ and CH${}_3$I-air line-broadening coefficients calculated for the ${\nu }_6$ fundamental can be used for other perpendicular and parallel bands.

CH${}_3$为^R R、^P R、^R P、^P P、^R Q 和^P Q 子分支计算了 296 K 时的 I-氧线加宽系数。${\nu }_6$ 带在很宽的旋转量子数范围内（$0\le J\le 70$, $钾\le 20$通过半经典和半经验方法。计算值与可用的实验数据相比非常有利，因此可以安全地用作估计数据库中缺少的高扩展系数$J$ 和 $钾$. CH的理论数据${}_3$输入输出${}_2$ 进一步结合先前计算的室温 CH${}_3$在${}_2$线加宽系数以获得大气应用所需的空气加宽值。计算结果表明与现有的两套 CH 都具有极好的一致性${}_3$I-空气测量。由于 CH 的振动依赖性${}_3$I 氧增宽系数很小，类似于氮增宽情况，CH${}_3$输入输出${}_2$ 和CH${}_3$为 ${\nu }_6$ basic 可用于其他垂直和平行波段。