Deactivation of Bending Mode of CO2 by Hydrogen and Deuterium

The rate of deactivation of bending mode of CO₂ by hydrogen and by deuterium is calculated using long‐range forces. It is shown that orthohydrogen is an order of magnitude more effective than parahydrogen at room temperature, the deactivation being affected by $\text{J\hspace{0.17em}=\hspace{0.17em}1\hspace{0.17em}→\hspace{0.17em}J\hspace{0.17em}=\hspace{0.17em}3}$ rotational transition of the ground vibrational level. The agreement with the available data is good up to ∼500°K. The calculation for deactivation by deuterium due to rotational transition $\text{J\hspace{0.17em}=\hspace{0.17em}4\hspace{0.17em}→\hspace{0.17em}J\hspace{0.17em}=\hspace{0.17em}6}$ yields results which are in reasonable agreement with the results of Cottrell and Day.